2018

  • Nathan Henry, David Burghoff, Yang Yang, Qing Hu, Jacob B Khurgin, “Pseudo-random dynamics of frequency combs in free running quantum cascade lasers,” Optical Engineering, 57, 011009 (2018). [PDF]

2017

  • Petar Tzenov, David Burghoff, Qing Hu, and Christian Jirauschek, “Temporal dynamics of THz quantum cascade laser frequency combs with strong injector anticrossing”, Proc. of SPIE Vol. 10226 102260N-1, (2017). (Best Young Scientist Award) [PDF]
  • Tsung-Yu Kao, John L. Reno, Qing Hu, “Amplifiers of Free-space Terahertz Radiation,” Optica, 4, 713 (2017). [PDF]
  • Yuri V. Flores and Asaf Albo, “Impact of Interface Roughness Scattering on the Performance of GaAs/AlxGa1-xAs Terahertz Quantum Cascade Lasers,” IEEE JQE, 53, 2300208 (2017). [PDF]
  • Petar Tzenov, David Burghoff, Qing Hu, Christian Jirauschek, “Analysis of operating regimes of terahertz quantum cascade laser frequency combs,” IEEE Trans. TST, 7, 351 (2017). [PDF]
  • Ali Khalatpour, John L. Reno, Nazir P. Kherani, and Qing Hu, “Unidirectional Photonic Wire Laser,” Nat. Phot. 11, 555 (2017). [PDF]
  • Asaf Albo and Yuri V. Flores, “Carrier Leakage Dynamics in Terahertz Quantum Cascade Lasers,” IEEE JQE, 53, 8500508 (2017). [PDF]
  • Asaf Albo, Yuri V. Flores, Qing Hu, and John L. Reno, “Two-well terahertz quantum cascade lasers with suppressed carrier leakage,” Appl. Phys. Lett. 111, 111107 (2017). [PDF]
  • Yang Yang, David Burghoff, John Reno, and Qing Hu, “Achieving comb formation over the entire lasing range of quantum cascade lasers,” Op. Lett. 42, 3888 (2017). [PDF]
  • B. Mirzaei, J. R. G. Silva, D. Hayton, C. Groppi, T. Y. Kao, Q. Hu, J. L. Reno, and J. R. Gao, “8-beam local oscillator array at 4.7 THz generated by a phase grating and a quantum cascade laser,” Optics Express 25, 29587 (2017). [PDF]
  • David Burghoff, “Terahertz Quantum Cascade Laser Frequency Combs,” CLEO 2017, San Jose, CA, May 13-18 (2017). (Invited)
  • Yang Yang, David Burghoff, John Reno, and Qing Hu, “Fully Dispersion Compensated THz Quantum Cascade Laser Frequency Combs,” CLEO 2017, San Jose, CA, May 13-18 (2017).
  • David Burghoff, Yang Yang, John Reno, and Qing Hu, “Terahertz quantum cascade laser combs and multiheterodyne spectroscopy,” Advanced Photonics Congress 2017, New Orleans, LA, July 24-27 (2017). (invited)
  • Qing Hu, “THz QCL Frequency Combs and Their Applications,” 2017 42nd International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2017), Cancun, Mexico, August 27 – September 1 (2017). (Plenary talk)
  • Lukasz Sterczewski, Jonas Westberg, Yang Yang, David Burghoff, John Reno, Qing Hu, Gerard Wysocki, “Terahertz Multiheterodyne Spectroscopy With Quantum Cascade Lasers –  A Feasibility Study,” 2017 42nd International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2017), Cancun, Mexico, August 27 – September 1 (2017).
  • Qing Hu, “THz amplifiers, phased arrays, and novel emitting structures,” ITQW2017, The 14th International Conference on Intersubband Transitions in Quantum Wells, Singapore, September 10-15 (2017). (Plenary talk)
  • Jacob B Khurgin, Nathan Henry, David Burghoff, Yang Yang, Qing Hu, “Temporal Dynamics of QCL frequency combs,” ITQW2017, The 14th International Conference on Intersubband Transitions in Quantum Wells, Singapore, September 10-15 (2017). (Invited)
  • Asaf Albo, Yuri V. Flores, Qing Hu, and John L. Reno, “Direct-phonon terahertz light-emitting intersubband lasers,” ITQW2017, The 14th International Conference on Intersubband Transitions in Quantum Wells, Singapore, September 10-15 (2017).
  • Behnam Mirzaei, J. R. G Silva, J. R Gao, C Groppi, T. Y Kao, Q Hu and J. L Reno, “An 8-Beam, 4.7 THz Local Oscillator Using a Quantum Cascade Laser and a Phase Grating,” ITQW2017, The 14th International Conference on Intersubband Transitions in Quantum Wells, Singapore, September 10-15 (2017).
  • Jonas Westberg, Lukasz Sterczewski, Link Patrick, Yang Yang, David Burghoff, John Reno, Qing Hu and Gerard Wysocki, “Terahertz multiheterodyne spectroscopy of molecular samples with quantum cascade laser frequency combs,” ITQW2017, The 14th International Conference on Intersubband Transitions in Quantum Wells, Singapore, September 10-15 (2017).
  • Yang Yang, David Burghoff, John Reno, Qing Hu, “Full dynamic range comb formation in terahertz quantum cascade lasers,” ITQW2017, The 14th International Conference on Intersubband Transitions in Quantum Wells, Singapore, September 10-15 (2017).

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2016

  • Asaf Albo and Yuri V. Flores, “Temperature-Driven Enhancement of the Stimulated Emission Rate in Terahertz Quantum Cascade Lasers,” IEEE JQE 53, 2300105 (2016). [PDF]
  • Petar Tzenov, David Burghoff, Qing Hu, and Christian Jirauschek, “Time domain modeling of terahertz quantum cascade lasers for frequency comb generation,” Op. Ex. 24, 23232 (2016). [PDF]
  • Asaf Albo, Qing Hu, and John L. Reno, “Room temperature negative differential resistance in terahertz quantum cascade laser structures,” Appl. Phys. Lett. 109, 081102 (2016). [PDF]
  • Tsung-Yu Kao, John L. Reno, and Qing Hu, “Phase-locked laser arrays through global antenna mutual coupling,” Nature Photonics, 10, 541 (2016). [PDF] [Cover]
  • Yang Yang, David Burghoff, Darren J. Hayton, Jian-Rong Gao, John L. Reno, and Qing Hu, “Terahertz multiheterodyne spectroscopy using laser frequency combs,” Optica, 3, 499 (2016). [PDF]
  • Alan W. Lee, Tsung-Yu Kao, Ian A. Zimmerman, Naoki Oda, and Qing Hu, “Terahertz Imaging with Quantum Cascade Lasers,” Proceedings of SPIE, 9854, 98540R-1 (2016). [PDF]
  • Alan W. M. Lee, Tsung-Yu Kao, Ian A. Zimmerman, William T. S. Cole, Richard Thurston, Richard J. Saykally, Ningren Han, Qing Hu, “THz QCLs for heterodyne receivers and wavelength modulation spectroscopy,” Proceedings of SPIE, 9836, 98362O (2016).[PDF]
  • B. Mirzaei, D. Hayton, D. Thoen, J. R. Gao, T. Y. Kao, Q. Hu, and J. L. Reno, “An Extensive Study on Frequency Tuning of Third-order Distributed Feedback Terahertz Quantum Cascade Lasers by SiO2 and PMMA”, IEEE Trans. TST, 6, 851 (2016).[PDF]
  • David Burghoff, Yang Yang, John L. Reno, and Qing Hu, “Dispersion dynamics of quantum cascade lasers,” Optica, 3, 1362 (2016).[PDF]
  • David Burghoff, Yang Yang, and Qing Hu, “Computational multiheterodyne spectroscopy”, Sci. Adv. 2016;2: e1601227 (2016).[PDF]
  • Chun Wang I. Chan, Asaf Albo, Qing Hu, and John L. Reno, “Tradeoffs between oscillator strength and lifetime in terahertz quantum cascade lasers,” Appl. Phys. Lett. 109, 201104 (2016).[PDF]
  • Darren J. Hayton, Jain-rong Gao, Wouter Laauwen, Behnam Mirzaei, Andrey Khudchenko, Jenna L. Kloosterman, Dmitry Paveliev, Qing Hu, Wilt Kao, Vladimir Vax, Chris K. Walker, “A 4.7 THz HEB QCL Receiver for STO2”, 27TH INTERNATIONAL SYMPOSIUM ON SPACE TERAHERTZ TECHNOLOGY, NANJING, CHINA, APRIL 13-15 (2016). [PDF]
  • Qing Hu, “THz QCL frequency combs, amplifiers, and antenna-coupled efficient emitters,” International Conference on Terahertz Emission, Metamaterials and Nanophotonics, Cartagena, Columbia, April 3-10 (2016). (Invited)
  • Alan W. Lee, Ian A. Zimmerman, Tsung-Yu Kao, Naoki Oda, and Qing Hu, “Terahertz imaging with quantum cascade lasers”, SPIE Conference on Image Sensing Technologies: Materials, Devices, Systems, and Applications III, part of SPIE Commercial + Scientific Sensing and Imaging, Baltimore, April 17-21 (2016). (Invited)
  • Alan W. M. Lee, Tsung-Yu Kao, Ian A. Zimmerman, William T. S. Cole, Richard Thurston, Richard J. Saykally, Ningren Han, Qing Hu, “THz QCLs for heterodyne receivers and wavelength modulation spectroscopy,” Proc. SPIE 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII, 98362O, May 25 (2016).
  • Yang Yang, David Burghoff, John Reno, and Qing Hu, “Computational-assisted THz dual-comb spectroscopy using quantum cascade laser frequency combs,” CLEO 2016, San Jose, CA, June 5-10 (2016).
  • Qing Hu, “tuning of QCLs and frequency combs,” 2016 International Quantum Cascade Lasers School and Workshop, Cambridge, UK, September 4-9 (2016). (Invited tutorial)
  • Petar Tzenov, David Burghoff, Qing Hu, and Christian Jirauschek, “Analysis of operating regimes of terahertz QCL frequency combs,” 2016 International Quantum Cascade Lasers School and Workshop, Cambridge, UK, September 4-9 (2016).
  • Asaf Albo and Qing Hu, “Towards Room Temperature Operation: High Barrier Terahertz Quantum Cascade Lasers,” 2016 International Quantum Cascade Lasers School and Workshop, Cambridge, UK, September 4-9 (2016).
  • Yang Yang, David Burghoff, John Reno, and Qing Hu, “Pulsed THz dual-comb spectroscopy using quantum cascade laser combs,” 2016 International Quantum Cascade Lasers School and Workshop, Cambridge, UK, September 4-9 (2016).
  • Petar Tzenov, David Burghoff, Michael Riesch, Qing Hu, and Christian Jirauschek, “Coupled transmission line-Maxwell Bloch simulation approach for analysis of active mode locking in terahertz quantum cascade lasers,” 2016 International Quantum Cascade Lasers School and Workshop, Cambridge, UK, September 4-9 (2016).
  • Behnam Mirzaei, D.J. Hayton, David Thoen, Jian-Rong Gao, T. Y Kao, Qing Hu and John Reno, “Frequency Tuning of Third-order Distributed Feedback Terahertz Quantum Cascade Lasers by SiO2 and PMMA,” 2016 International Quantum Cascade Lasers School and Workshop, Cambridge, UK, September 4-9 (2016).

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2015

  • Tsung-Yu Kao, Xiaowei Cai, Alan W.M. Lee, John L. Reno, and Qing Hu, “Antenna Coupled Photonic Wire Lasers,” Optics Express, 23, 17091- 17100, (2015).[PDF]
  • David Burghoff, Y. Yang, Darren J. Hayton, Jian-Rong Gao, John L. Reno, and Qing Hu, “Evaluating the coherence and time-domain profile of quantum cascade laser microcombs,” Optics Express, 23,  1190-1202 (2015). [PDF]
  • Asaf Albo and Qing Hu, “Investigating temperature degradation in THz quantum cascade lasers by examination of temperature dependence of output power,” Appl. Phys. Lett. 106, 131108 (2015). [PDF]
  • N. van Marrewijk, B. Mirzaei, D. Hayton, J. R. Gao, T. Y. Kao, Q. Hu, and J. L. Reno, “Frequency locking and monitoring based on bi-directional terahertz radiation of a 3rd-order distributed feedback quantum cascade laser,” J Infrared Milli Terahz Waves, 36, 1210 (2015). [PDF]
  • Asaf Albo and Qing Hu, “Carrier leakage into the continuum in diagonal GaAs/Al0.15GaAs terahertz quantum cascade lasers, Appl. Phys. Lett. 107, 241101 (2015). [PDF]
  • William T.S. Cole, Nik C. Hlavacek, Alan W.M. Lee, Tsung-Yu Kao, Qing Hu, John L. Reno, Richard J. Saykally, “A Terahertz VRT spectrometer employing quantum cascade lasers”, Chem. Phys. Lett. 638, 144 (2015). [PDF]
  • Q. Hu, “Terahertz Laser Frequency Combs,” East China Normal University, Shanghai, January 12 (2015). (invited)
  • Q. Hu, “Terahertz Laser Frequency Combs,” University of Shanghai Science and Technology (USST), Shanghai, January 13 (2015). (invited)
  • Q. Hu, “THz quantum cascade lasers and their applications,” Nanyang Technological University, Singapore, January 15 (2015). (invited)
  • Q. Hu, “THz quantum cascade lasers and their applications,” National University of Singapore, Singapore, January 16 (2015). (invited)2014
  • David Burghoff, Yang Yang, Darren J. Hayton, Jian-Rong Gao, John L. Reno, and Qing Hu, “Evaluating the temporal profile of quantum cascade laser frequency combs,” CLEO: 2015, San Jose, CA, May 11-15 (2015).
  • Q. Hu, “Terahertz Laser Frequency Combs,” OSA SENSORS topical meeting, Boston, June 27 – July 1 (2015). (invited)
  • Q. Hu, “THz quantum cascade lasers and their applications,” student workshop in IRMMW-THz 2015 Conference, Hong Kong, August 23 (2015). (invited)
  • Asaf Albo and Qing Hu, “Temperature degradation mechanism of diagonal versus vertical terahertz quantum cascade lasers,” ITQW2015, The 13th International Conference on Intersubband Transitions in Quantum Wells, Vienna, Austria, September 6-11 (2015).
  • B. Mirzaei, N. van Marrewijk, D. Hayton, J. R. Gao, T. Y. Kao, Q. Hu, and J. L. Reno, “Frequency locking and monitoring based on bi-directional terahertz radiation of a 3rd-order distributed feedback QCL,” ITQW2015, The 13th International Conference on Intersubband Transitions in Quantum Wells, Vienna, Austria, September 6-11 (2015).
  • David Burghoff, Yang Yang, John L. Reno, and Qing Hu, “Coherent breathing of laser modes in terahertz quantum cascade lasers,” ITQW2015, The 13th International Conference on Intersubband Transitions in Quantum Wells, Vienna, Austria, September 6-11 (2015).
  • Yang Yang, David Burghoff, John L. Reno, and Qing Hu, “Towards THz dual-comb spectrometer based on quantum cascade laser frequency combs,” ITQW2015, The 13th International Conference on Intersubband Transitions in Quantum Wells, Vienna, Austria, September 6-11 (2015).
  • Q. Hu, “Terahertz Laser Frequency Combs,” Electrical Sciences and Computer Engineering (ESCE) Seminar, Brown University, November 16 (2015). (invited)

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2014

  • Rudra Sankar Dhar, Seyed Ghasem Razavipour, Emmanuel Dupont, Chao Xu, Sylvain Laframboise, Zbig Wasilewski, Qing Hu, Dayan Ban, “Direct Nanoscale Imaging of Evolving Electric Field Domains in Quantum Structures,” Scientific Report, 4, 7183 (2014). [PDF]
  • S. G. Razavipour, E. Dupont, C. W. I. Chan, C. Xu, Z. R. Wasilewski, S. R. Laframboise, Q. Hu, and D. Ban, “A high carrier injection terahertz quantum cascade laser based on indirectly pumped scheme,” Appl. Phys. Lett. 104, 041111 (2014). [PDF]
  • David Burghoff, Tsung-Yu Kao, Ningren Han, Chun Wang Chan, Xiaowei Cai, Yang Yang, Darren Hayton, Jian-Rong Gao, John L. Reno, Qing Hu, “Terahertz laser frequency combs,” Nature Photonics 8, 462 (2014). [PDF] [Cover]
  • Ningren Han, Alexander de Geofroy, Chun Wang I. Chan, David P. Burghoff, Alan Wei Min Lee, John L. Reno, and Qing Hu, “Broadband all-electronically tunable terahertz quantum cascade lasers,” Opt. Lett. 39, 3480 (2014). [PDF] Also selected for publication in the Virtual Journal for Biomedical Optics (VJBO), http://vjbo.osa.org/virtual_issue.cfm.
  • D. J. Hayton, J. L. Kloosterman, Y. Ren, J. R. Gao, T. M. Klapwijk, Q. Hu, C. K. Walker, and J. L. Reno, “A 4.7 THz Heterodyne Receiver for a Balloon Borne Telescope,” Proc. of SPIE, 9153, 91531R (2014). [PDF]
  • Q. Hu, “THz frequency combs, light amplifiers, and antenna-enhanced emitters”, 20 Years of Quantum Cascade Laser Anniversary Workshop, ETH Zurich, Switzerland, January 16-17 (2014). (Invited)
  • Tsung-Yu Kao, Xiaowei Cai, Qing Hu, and John L. Reno, “Microstrip antenna coupled distributed feedback terahertz quantum-cascade laser”, OE114-19, Photonics West 2014, San Francisco, February 1-6 (2014). (Invited)
  • D. J. Hayton, A. Khudchenko, D.G. Pavelyev, A. Baryshev, J. R. Gao, T.Y. Kao, Q. Hu, J.L. Reno, and V. Vaks, “Phase-locking of a 4.7 THz quantum cascade laser based on a harmonic super-lattice mixer,” The 25th International Symposium on Space Terahertz Technology, ISSTT2014, Moscow, 27-30 April (2014).
  • David Burghoff, Tsung-Yu Kao, Ningren Han, Chun Wang Ivan Chan, Darren J. Hayton, Jian-Rong Gao, John L. Reno, Qing Hu, “Development of terahertz laser frequency combs,” CLEO: 2014, San Jose, CA, June 8-13 (2014).
  • D. J. Hayton, J. L. Kloosterman, Y. Ren, T.Y. Kao, J. R. Gao, T. N. Klapwijk, Q. Hu, C. K. Walker, and J. L. Reno,, “A 4.7 THz Heterodyne Receiver for a Balloon Borne Telescope,”, PIE Astronomical Telescope + Instrumentation Conference, Montréal, Canada, June 22-27 (2014).
  • Q. Hu, “Terahertz Laser Frequency Combs,” 4th RIEC-RLE Meeting on Research Collaboration in Photonics, Tohoku University, Sendai, Japan, July 1-2 (2014). (Invited)
  • Rudra Sankar Dhar, Seyed Ghasem Razavipour, Emmanuel Dupont, Chao Xu, Sylvain Laframboise, Zbig Wasilewski, Qing Hu, Dayan Ban, “Direct Observation of Electric Field Domain in the Active Region of Terahertz Quantum Cascade Laser,” International Quantum Cascade Lasers School & Workshop 2014, Policoro, Italy, September 7-12 (2014).
  • Jian-Rong Gao, Darren J. Hayton, Nathan Vercruyssen, Chris K. Walker, Jenna L. Kloosterman, Qing Hu, Tsung-Yu Kao, and John Reno, “4.7 THz QCL as Local Oscillator for NASA Stratospheric Terahertz Observatory (STO),” International Quantum Cascade Lasers School & Workshop 2014, Policoro, Italy, September 7-12 (2014).
  • Q. Hu, “THz QCL frequency combs, amplifiers, and antenna-coupled efficient emitters,” International Quantum Cascade Lasers School & Workshop 2014, Policoro, Italy, September 7-12 (2014). (Keynote)
  • David Burghoff, “Terahertz quantum cascade laser frequency combs,” International Quantum Cascade Lasers School & Workshop 2014, Policoro, Italy, September 7-12 (2014). (Invited)
  • Darren J. Hayton, Jian-Rong Gao, Nathan Vercruyssen, Chris K. Walker, Jenna L. Kloosterman, Qing Hu, and Tsung-Yu Kao, “A 4.7 THz HEB/QCL Heterodyne Receiver for STO-2,” 39th International Conference on Infrared, Millimeter, and THz Waves, Tucson, AZ, September 14-19 (2014).
  • A. V. Khudchenko, D. J. Hayton, D. G. Pavelyev, A. M. Baryshev, J. R. Gao, T-Y. Kao, Q. Hu, J. L. Reno, and V. L. Vaks, “Phase Locking a 4.7 THz Quantum Cascade Laser using a Super-Lattice Diode as Harmonic Mixer,” 39th International Conference on Infrared, Millimeter, and THz Waves, Tucson, AZ, September 14-19 (2014).
  • Q. Hu, “Terahertz Laser Frequency Combs”, 7th International Symposium on Ultrafast Phenomena and Terahertz Waves, October 13-14, Shanghai, China (2014).

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2013

  • J. L. Kloosterman, D. J. Hayton, Y. Ren, W. Kao, J. N. Hovenier, J. R. Gao, T. M. Klapwijk, Q. Hu, C. K. Walker, and J. L. Reno, “Hot electron bolometer heterodyne receiver with a 4.7-THz quantum cascade laser as a local oscillator,” Appl. Phys. Lett. 102, 011123 (2013).[PDF]
  • Qi Qin, Ningren Han, Wilt Kao, J. L. Reno, and Qing Hu, “An effective mode selector for tunable terahertz wire-lasers,” Opt. Lett. 38, 407 (2013). [PDF]
  • S. Fathololoumi, E. Dupont, Z. R. Wasilewski, C. W. I. Chan, S. G. Razavipour, S. R. Laframboise, Shengxi Huang, Q. Hu, D. Ban, and H. C. Liu, “Effect of Oscillator Strength and Intermediate Resonance on the Performance of Resonant Phonon-based Terahertz Quantum Cascade Lasers,” J. Appl. Phys. 113, 113109 (2013). [PDF]
  • M. Cui, J. N. Hovenier, Y. Ren, N. Vercruyssen, J. R. Gao, T-Y. Kao, Q. Hu, and J. L. Reno, “Beam and phase distributions of a terahertz quantum cascade wire laser,” Appl. Phys. Lett. 102, 111113 (2013). [PDF]
  • S. G. Razavipour, E. Dupont, S. Fathololoumi, C. W. I. Chan, M. Lindskog, Z. R. Wasilewski, G. Aers, S. R. Laframboise, A. Wacker, Q. Hu, D. Ban, and H. C. Liu, “An indirectly pumped Terahertz Quantum Cascade Laser with low injection coupling strength operating above 150 K,” J. Appl. Phys. 113, 203107 (2013). [PDF]
  • D. J. Hayton, A. Khudchencko, D. G. Pavelyev, J. N. Hovenier, A. Baryshev, J. R. Gao, T. Y. Kao, Q. Hu, J. L. Reno, V. Vaks, “Phase locking of a 3.4 THz third-order distributed feedback quantum cascade laser using a room-temperature superlattice harmonic mixer,” Appl. Phys. Lett. 103, 051115 (2013). [PDF]
  • Chun Wang I. Chan, Qing Hu, and John L. Reno, “Tall-Barrier Terahertz Quantum Cascade Lasers,” Appl. Phys. Lett.103, 151117 (2013). [PDF]
  • Qing Hu and Alan W. Lee, “Lens coupled quantum cascade laser,” U. S. Patent No. 8,619,832, issued on December 31, 2013.
  • A. Khudchenko, D. J. Hayton, D. Paveliev, J. N. Hovenier, A. Baryshev, J. R. Gao, T-Y. Kao, Q. Hu, and J.L. Reno, “Phase-locking of a 3.4-THz quantum cascade laser using a harmonic super-lattice mixer,” The 24th International Symposium on Space Terahertz Technology, ISSTT2013, Groningen, the Netherlands, April 8-10 (2013).
  • D. J. Hayton, J. L. Kloosterman, Y. Ren, T.Y. Kao, J. N. Hovenier, J. R. Gao, T. N. Klapwijk, Q. Hu, C. K. Walker, and J. L. Reno, “4.7 THz hot electron bolometer – quantum cascade laser heterodyne receiver performance,” The 24th International Symposium on Space Terahertz Technology, ISSTT2013, Groningen, the Netherlands, April 8-10 (2013).
  • M. Cui, J.R. Gao, J.N. Hovenier, Y. Ren, N. Vercruyssen, T-Y. Kao, Q. Hu, and J. L. Reno, “Beam and phase distributions of a 3.5-THz quantum cascade wire laser,” The 24th International Symposium on Space Terahertz Technology, ISSTT2013, Groningen, the Netherlands, April 8-10 (2013).
  • Tsung-Yu Kao, Qing Hu, and John L. Reno, “Microstrip Antenna Coupled Distributed Feedback Terahertz Quantum-Cascade Lasers,” CLEO: 2013, CTu1J.3 San Jose, CA, June 11 (2013).
  • Andrey V. Khudchenko, D. J. Hayton, A. M. Baryshev, J. R. Gao, T-Y. Kao, Q. Hu, D. G. Paveliev,J. N. Hovenier, J.L. Reno, and V. L. Vaks “Phase-locking of a 3.4-THz quantum cascade laser using a harmonic super-lattice mixer,” The 38th International Conference on Infrared, Millimeter and Terahertz Waves IRMMW-THz 2013, Mainz on the Rhine, Germany, September 1-6 (2013).
  • Chun Wang I. Chan, Qing Hu, and John L. Reno, “Tall-Barrier Terahertz Quantum Cascade Lasers,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013).
  • Tsung-Yu Kao, Qing Hu, and John L. Reno, “Terahertz Light Amplifier,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013). (Invited)
  • Tsung-Yu Kao, Xiaowei Cai, Qing Hu, and John L. Reno, “Microstrip Antenna Coupled Distributed Feedback Terahertz Quantum-Cascade Lasers,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013).
  • Ningren Han, Chun Wang I. Chan, David P. Burghoff, Alan Wei Min Lee, Tsung-Yu Kao, Qing Hu, and John L. Reno, “Broadband Electrically-Tunable Terahertz Quantum Cascade Lasers,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013).
  • M. Cui, J. N. Hovenier, Y. Ren, N. Vercruyssen, D. J. Hayton, J. R. Gao, T-Y. Kao, Q. Hu, and J. L. Reno, “Beam and phase distribution of a third-order distributed feedback THz QCL,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013).
  • D. J. Hayton, A. Khudchencko, D. G. Pavelyev, J. N. Hovenier, A. Baryshev, J. R. Gao, T. Y. Kao, Q. Hu, J. L. Reno, V. Vaks, “Phase locking of a 3.4 THz third-order distributed feedback quantum cascade laser using a room-temperature superlattice harmonic mixer,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013).
  • David Burghoff, Ningren Han, Tsung-Yu Kao, David Levonian, Qing Hu, and John Reno, “Evidence of comb formation in terahertz quantum cascade lasers,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013).
  • Xiaowei Cai, Tsung-Yu Kao, Qing Hu, and John L. Reno, “2-THz Quantum Cascade Lasers with Microstrip Antennae,” THE 12TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2013), New York, September 16-20 (2013).

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2012

  • I. Bhattacharya, C. W. I. Chan, and Q. Hu, “Effects of stimulated emission on transport in terahertz quantum cascade lasers based on diagonal designs,” Appl. Phys. Lett. 100, 011108 (2012).[PDF]
  • Alan Wei Min Lee, Tsung-Yu Kao, David Burghoff, Qing Hu, and John L. Reno, “Terahertz Tomography Using Quantum-Cascade Lasers,” Opt. Lett. 37, 217 (2012).[PDF]
  • Sushil Kumar and Qing Hu, “Investigation of possible microcavity effect on lasing threshold of nonradiative-scattering-dominated semiconductor lasers,” Appl. Phys. Lett. 100, 041105 (2012).[PDF]
  • Y. Ren, J. N. Hovenier, M. Cui, D. J. Hayton, J. R. Gao, T. M. Klapwijk, S. C. Shi, T-Y. Kao, Q. Hu, and J. L. Reno, “Frequency locking of single-mode 3.5-THz quantum cascade lasers using a gas cell,” Appl. Phys. Lett. 100, 041111 (2012).[PDF]
  • S. Fathololoumi, E. Dupont, C.W.I. Chan, Z.R. Wasilewski, S.R. Laframboise, D. Ban, A. Mátyás, C. Jirauschek, Q. Hu, and H.C. Liu, “Terahertz quantum cascade lasers operating up to ~200 K with optimized oscillator strength and improved injection tunneling,” Optics Express, 20, 3866 (2012).[PDF]
  • Miriam S. Vitiello, Rita C. Iotti, Fausto Rossi, Alessandro Tredicucci, Qing Hu, and Gaetano Scamarcio, “Non-equilibrium longitudinal and transverse optical phonons in terahertz quantum cascade lasers,” Appl. Phys. Lett. 100, 091101 (2012).[PDF]
  • Tsung-Yu Kao, Qing Hu, and John L. Reno, “Perfectly Phase-matched Third-order DFB Terahertz Quantum-Cascade Lasers,” Opt. Lett. 37, 2070 (2012).[PDF]
  • David Burghoff, Chun Wang Ivan Chan, Qing Hu, John Reno, “Gain measurements of scattering-assisted terahertz quantum cascade lasers,” Appl. Phys. Lett. 100, 261111 (2012).[PDF]
  • Y. Ren, D.J. Hayton, J.N. Hovenier, M. Cui, J.R. Gao, T.M. Klapwijk, S.C. Shi, T-Y. Kao, Q. Hu, and J.L. Reno, “Frequency and amplitude stabilized terahertz quantum cascade laser as local oscillator,” Appl. Phys. Lett. 101, 101111 (2012).[PDF]
  • Chun Wang I. Chan, Qing Hu, and John L. Reno, “Ground State Terahertz Quantum Cascade Lasers,” Appl. Phys. Lett. 101, 151108 (2012). [PDF]
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Applications,” special seminar, Capital Normal University, Beijing, China, March 26 (2012). (Invited)
  • Y. Ren, J.N. Hovenier, D.J. Hayton, M. Cui, J.R. Gao, T.M. Klapwijk, S.C. Shi, T-Y. Kao, Q. Hu, and J. L. Reno, “Stabilized HEB-QCL heterodyne spectrometer at super-terahertz”, at the 23rd International Symposium on Space Terahertz Technology, Tokyo, Japan, April 2-4, (2012).
  • Q. Hu, “THz Quantum Cascade Lasers, Sensing, and Real-Time Imaging,” DTRA CB Defense THz Forum, Falls Church, Virginia, April 3 (2012). (Invited)
  • Q. Hu, “Terahertz quantum-cascade lasers and applications,” Applied Physics Department Seminar, Yale University, New Haven, CT, May 2 (2012). (Invited)
  • S. Fathololoumi, E. Dupont, C.W.I. Chan, Z. R. Wasilewski, S. R. Laframboise, D. Ban, A. Matyas, C. Jirauschek, Q. Hu, and H. C. Liu, “199.5 K Operation of THz Quantum Cascade Lasers,” CLEO/IQEC 2012, CTu2B.1, San Jose, CA, May 8 (2012).
  • Q. Hu, “Terahertz quantum-cascade lasers and applications,” University of Electronic Science and Technology of China (UESTC), Chengdu, China, May 25 (2012). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Applications”, Optical Society of America Optical Sensors Meeting, Monterey, CA, June 27 (2012). (Invited)
  • Yuan Ren, J. Niels Hovenier, Darren J. Hayton, Moxi Cui, Jian-Rong Gao, Teunis M. Klapwijk, Sheng-Cai Shi, Tsung-Yu Kao, Qing Hu, and John L. Reno, “Stabilized HEB-QCL heterodyne spectrometer at super-terahertz,” SPIE Astronomical Telescopes + Instrumentation, Amsterdam, the Netherlands, July 1-6 (2012).
  • Naoki Oda, Tsutomu Ishi, Alan W.M. Lee, Qing Hu, and H. Tabata, “Real-Time Terahertz Microscope with Palm-size Terahertz Camera and Compact Quantum Cascade Laser,” 2012 SPIE Optics+Photonics Conference, San Diego, CA, August 12-16 (2012). Published in Proceedings of SPIE, 8363, 83630A. (Invited)
  • Z. R. Wasilewski, E. Dupont, S. Fathololoumi, S. R. Laframboise, C. W. I. Chan, H. C. Liu, A. Mátyás, M. Lindskog, S. G. Razavipour, K. Vijay, D. Ban, Q. Hu, C. Jirauschek, A. Wacker, and M. A. Belkin, “MBE growth and optimization of THz quantum cascade lasers: towards high temperature operation,” MIOMD-XI Infrared Optoelectronics: Materials and Devices, Chicago, September 4-8 (2012). (Invited)
  • Q. Hu, “High-performance THz QCLs and applications,” International Quantum Cascade Lasers School & Workshop 2012, Vienna, Austria, September 2-6 (2012). (Invited tutorial)
  • Tsung-Yu Kao, Qing Hu and John L. Reno, “THz QCLs with High Power Extraction Efficiency Based on Slot Antennas,” International Quantum Cascade Lasers School & Workshop 2012, Vienna, Austria, September 2-6 (2012).
  • Jian-Rong Gao, Y Ren, D.J. Hayton, J.N. Hovenier, T.M. Klapwijk, T-Y. Kao, Q. Hu, J. L Reno, J. Kloosterman and C Walker, “Stabilizing both frequency and amplitude of a terahertz QCL for GUSSTO balloon observatory,” International Quantum Cascade Lasers School & Workshop 2012, Vienna, Austria, September 2-6 (2012).
  • Chun Wang I. Chan, Qing Hu, John L. Reno, “Ground State Terahertz Quantum Cascade Lasers,” International Quantum Cascade Lasers School & Workshop 2012, Vienna, Austria, September 2-6 (2012).
  • D. J. Hayton, J. L. Kloosterman, Y. Ren, T. Y. Kao, J. N. Hovenier, J. R. Gao, T. M. Klapwijk, Q. Hu, C. K. Walker, and J. L. Reno, “A 4.7 THz hot electron bolometer QCL heterodyne receiver,” International Quantum Cascade Lasers School & Workshop 2012, Vienna, Austria, September 2-6 (2012).
  • Qing Hu, “Terahertz quantum cascade lasers and applications,” Symposium on Frontiers in THz Technology (FTT 2012), Nara, Japan, November 27-29 (2012). (Invited plenary)

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2011

  • S. Kumar, C. W. I. Chan, Q. Hu, and J. L. Reno, “A 1.8 THz quantum-cascade laser operating up to 163 K; significantly above the temperature of ,” Nature Physics 7, 166-171 (2011).[PDF]
  • David Burghoff, Tsung-Yu Kao, Dayan Ban, Alan Wei Min. Lee, Qing Hu, and John Reno, “A terahertz pulse emitter monolithically integrated with a quantum cascade laser,” Appl. Phys. Lett. 98, 061112 (2011).[PDF]
  • Qi Qin, John L. Reno, and Qing Hu, “MEMS-based tunable terahertz wire-laser over 330 GHz,” Opt. Lett. 36, 692 (2011).[PDF]
  • Qi Qin and Qing Hu, “MEMS-plunger platform for tunable terahertz wire-laser at ~ 5 K,” J. Micromechanics and Microengineering, 21, 075004 (2011).[PDF]
  • Y. Ren, J.N. Hovenier, R. Higgins, J.R. Gao, T.M. Klapwijk, S.C. Shi, , B. Klein, T-Y. Kao, Q. Hu, and J. L. Reno, “High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz,” Appl. Phys. Lett. 98, 231109 (2011).[PDF]
  • J. Gambari, A. I. Fernandez-Dominguez, S. A. Maier, C. C. Phillips, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Thresholdless THz Lasing from a Semiconductor Nanostructure in a Strongly-Coupled Plasmonic Microcavity,” EPS “Nanometa” conference, Seefeld, Austria, January (2011).
  • Sushil Kumar, Qi Qin, Chun W. I. Chan, Qing Hu, and John L. Reno, “High-temperature performance and broad continuous tunability of terahertz quantum-cascade lasers,” IEEE Phonoics West, San Francisco, CA, 22-27 January (2011). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Applications,” special seminar, Shanghai Jiao Tong University, Shanghai, China, March 21 (2011). (Invited)
  • Y. Ren, M.Cui, J.N. Hovenier, J.R. Gao, T.M. Klapwijk, S.C. Shi, T-Y. Kao, Q. Hu, and J. L. Reno, “Frequency locking of a 3.5 THz quantum cascade laser using a gas cell,” 22nd International Symposium on Space Terahertz Technology, Tucson, 26-28 April (2011).
  • Tsung-Yu Kao; Qing Hu; John Reno, “True Phase-Matched Third-order DFB Terahertz Quantum-Cascade Lasers using Weakly-coupled Cavities,” CLEO/IQEC 2011, CThE4, Baltimore, MD, May 5 (2011).
  • David Burghoff; Tsung-Yu Kao; Dayan Ban; Alan Lee; John Reno; and Qing Hu, “Gain measurements of a metal-metal terahertz quantum cascade laser using an integrated terahertz pulse emitter,” CLEO/IQEC 2011, CThE5, Baltimore, MD, May 5 (2011).
  • Qi Qin; Qing Hu; John Reno, “Fast tuning of MEMS-based tunable terahertz wire lasers,” CLEO/IQEC 2011, CThE7, Baltimore, MD, May 5 (2011).
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Applications,” special seminar, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China, June 17 (2011). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Applications”, The 2011 International Symposium on Microwave/Terahertz Science and Applications (MTSA 2011), T1-2, Nanjing, China, June 21 (2011). (Invited)
  • Y. Ren, M.Cui, J.N. Hovenier, J.R. Gao, T.M. Klapwijk, S.C. Shi, T-Y. Kao, Q. Hu, and J. L. Reno, “Frequency locking of a 3.5 THz quantum cascade laser using a molecular absorption line,” THE 11TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2011), Sardinia, Italy, September 1-17 (2011).
  • Y. Ren, J.N. Hovenier, J.R. Gao, T.M. Klapwijk, S.C. Shi, T-Y. Kao, Q. Hu, and J. L. Reno, “High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz,” THE 11TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2011), Sardinia, Italy, September 1-17 (2011).
  • Tsung-Yu Kao, Qing Hu, and John L. Reno, “Perfectly Phase-Matched Third-order DFB THz Quantum-Cascade Lasers,” THE 11TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2011), Sardinia, Italy, September 1-17 (2011).
  • David Burghoff, Tsung-Yu Kao, Dayan Ban, Alan Wei Min Lee, John L. Reno, and Qing Hu, “Gain measurements of terahertz quantum cascade lasers using independent mode-matched emitters,” THE 11TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2011), Sardinia, Italy, September 1-17 (2011).
  • Chun Wang I. Chan, Saeed Fathololoumi, Emmanuel Dupont, Zbigniew R. Wasilewski, Sylvain R. Laframboise, Dayan Ban, Qing Hu, and H. C. Liu, “A terahertz quantum cascade laser operating up to 193 K,” THE 11TH INTERNATIONAL CONFERENCE ON INTERSUBBAND TRANSITIONS IN QUANTUM WELLS (ITQW2011), Sardinia, Italy, September 1-17 (2011).
  • Alan Lee, Tsung-Yu Kao, David Burghoff, Q. Hu, and J. L. Reno, “THz optical coherence tomography based on quantum cascade lasers,” IRMMW-THz 2011, Houston, TX, October 3-7 (2011). (Invited keynote talk)
  • Naoki Oda, Alan Lee, and Qing Hu, “Proposal for Real-Time Terahertz Imaging Systems, with Handy Terahertz Camera and Compact Quantum Cascade Laser,” Joint Conference, International Symposium on Terahertz Nanoscience (TeraNano 2011) and Workshop of International Terahertz Research Network (GDR-I), Osaka, Japan, November 24-29 (2011).

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2010

  • S. Kumar and Q. Hu, “Coherence of resonant-tunneling transport in terahertz quantum-cascade lasers,” Phys. Rev. B 80, 245316 (2009). Also published in Virtual Journal of Nanoscale Science & Technology, 21(1), January 4, (2010). [PDF]
  • A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Tunable Terahertz Quantum Cascade Lasers with External Gratings,” Opt. Lett. 35, 910 (2010). [PDF]
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Real-time T-rays Imaging at video rate,” J.TST, 2(4), (2010). [PDF]
  • T. Y. Kao, Q. Hu, and J. L. Reno, “Phase-Locked Arrays of Surface-Emitting Terahertz Quantum-Cascade Lasers,” Appl. Phys. Lett. 96, 101106 (2010). [PDF]
  • Christine A. Wang, Anish Goyal, Robin Huang, Joseph Donnelly, Daniel Calawa, George Turner, Antonio Sanchez-Rubio, Allen Hsu, Qing Hu, and B. Williams, “Strain-compensated GaInAs/AlInAs/InP quantum cascade laser material,” J. Crystal Growth, 312, 1157-1164 (2010). [PDF]
  • J. Gambari, S. A. Maier, B. S. Williams, S. Kumar, J. L. Reno, Q. Hu, and C. C. Phillips, “Thresholdless Coherent Light Scattering from Subband-polaritons in a Strongly-Coupled Microcavity,” Phys. Rev. B 82, 121303 (2010). [PDF]
  • Sushil Kumar, “Recent Progress in Terahertz Quantum-Cascade Lasers,” IEEE Journal of Quantum Electronics, vol, page (2010). (Invited) [PDF]
  • Y. Ren, J. N. Hovenier, R. Higgins, J. R. Gao, T. M. Klapwijk, S. C. Shi, A. Bell, B. Klein, T-Y. Kao, S. Kumar, Q. Hu, and J. L. Reno, “Terahertz heterodyne spectrometer using a quantum cascade laser,” Appl. Phys Lett. 97, 161105 (2010) .[PDF]
  • Qing Hu and Alan Wei Min Lee, “Real-Time, Continuous-Wave Terahertz Imaging Using a Microbolometer Focal-Plane Array,” U. S. Patent No. 7,692,147, issued on April 6, 2010.
  • Q. Hu, “Tunable THz lasers,” IEEE Winter Topicals 2010, Majorca, Spain. January 11-13 (2010). (Invited)
  • Q. Hu, ” Tunable and high-temperature THz quantum-cascade lasers”, IEEE Phonoics West, San Francisco, CA, January 23-28 (2010). [Paper Number: 7616-24] (Invited)
  • Y. Ren, J. N. Hovenier, R. Higgins, J. R. Gao, T. M. Klapwijk, S. C. Shi, A. Bell, B. Klein, W. Kao, S. Kumar, Q. Hu, and J. L. Reno, “Gas cell measurement using a 2.9 THz heterodyne receiver based on a quantum cascade laser and a superconducting hot electron bolometer,” 21ST INTERNATIONAL SYMPOSIUM ON SPACE TERAHERTZ TECHNOLOGY, OXFORD, 23-25 MARCH, (2010).
  • Y. Ren, P. J. de Visser, J. N. Hovenier, W. Zhang, P. Khosropanah, J. R. Gao, T. M. Klapwijk, S. C. Shi, W. Kao, S. Kumar, Q. Hu, and J. L. Reno, “3.5 THz surface emitting distributed feedback QCL operated at 70 K as local oscillator,” 21ST INTERNATIONAL SYMPOSIUM ON SPACE TERAHERTZ TECHNOLOGY, OXFORD, 23-25 MARCH, (2010).
  • Sushil Kumar, C. W. I. Chan, Q. Hu, and J. L. Reno, “Operation of a 1:8-THz Quantum-Cascade Laser Above 160 K,” CLEO/IQEC 2010, CThU1, San Jose, CA, May 20 (2010). (Invited)
  • Tsung-Yu Kao, Q. Hu, and J. L. Reno, “Phase-Locked Arrays of Surface-Emitting Terahertz Quantum-Cascade Lasers,” CLEO/IQEC 2010, CTuMM1, San Jose, CA, May 18 (2010).
  • Qi Qin, Benjamin S. Williams, Sushil Kumar, Q. Hu, and J. L. Reno, “Development of tunable terahertz wire lasers,” CLEO/IQEC 2010, CThU2, San Jose, CA, May 20 (2010).
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Applications,” Waterloo Institute for Nanotechnology seminar, University of Waterloo, Canada, July 15 (2010). (Invited)
  • S. Kumar, “THz QC lasers: recent progress and future challenges,” International Quantum Cascade Lasers School & Workshop, Florence, Italy, 
August 30 – September 03 (2010). (Invited tutorial)
  • Q. Hu, “Tunable THz wire lasers,” International Quantum Cascade Lasers School & Workshop, Florence, Italy, 
August 30 – September 03 (2010). (Invited)
  • T. Kao, “Phased array of surface emitting THz QCLs,” International Quantum Cascade Lasers School & Workshop, Florence, Italy, 
August 30 – September 03 (2010). (Invited)
  • D. Burghoff, Dayan Ban, S. Kumar, Q. Hu, and J. L. Reno, “Gain measurements of terahertz quantum-cascade lasers with metal-metal waveguides,” International Quantum Cascade Lasers School & Workshop, Florence, Italy, 
August 30 – September 03 (2010).
  • C. W. I. Chan, S. Kumar, Q. Hu, and J. L. Reno, “A 1.8 THz Quantum Cascade Laser operating up to 163 K,” International Quantum Cascade Lasers School & Workshop, Florence, Italy, 
August 30 – September 03 (2010).
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Their Applications,” IRMMW-THz2010, Rome, Italy, September 5-10 (2010). (Invited Plenary Talk)

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2009

  • A. Wade, G. Fedorov, D. Smirnov, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “Magnetic-field-assisted terahertz quantum cascade laser operating up to 225 K,” Nature Photonics, 3, 41 (2009). [PDF]
  • Q. Hu, “Quantum warming,” cover interview, Nature Photonics, 3, 64 (2009). [PDF]
  • P. Khosropanah, A. Baryshev, W. Zhang, W. Jellema, J.N. Hovenier, J.R. Gao, T.M. Klapwijk, D.G. Paveliev, B. S. William, S. Kumar, Q. Hu, and J. L. Reno, “Phase-locking of a 2.7-THz quantum cascade laser to a microwave reference,” Opt. Lett. 34, 2958 (2009). [PDF]
  • S. Kumar, Q. Hu, and J. L. Reno, “186 K operation of THz quantum cascade lasers based on a diagonal design,” Appl. Phys. Lett. 94, 131105 (2009). [PDF]
  • Q. Qin, B. S. Williams, S. Kumar, J. L. Reno, and Q. Hu, “Tuning a Terahertz Wire Laser,” Nature Photonics, 3, 732-737 (2009). [PDF]
  • S. Kumar, C. W. I. Chan, Q. Hu, and J. L. Reno, “Two-well terahertz quantum-cascade laser with direct intrawell-phonon depopulation,” Appl. Phys. Lett. 95, 141110 (2009). Also published in Virtual Journal of Nanoscale Science & Technology, 20(16), October 19 (2009). [PDF]
  • Qing Hu and Benjamin S. Williams, “Terahertz Lasers and Amplifiers Based on Resonant Optical Phonon Scattering to Achieve Population Inversion,” U. S. Patent No. 7,548,566, issued on June 16, 2009.
  • Qing Hu and Alan W. Lee, “Lens coupled quantum cascade laser,” M.I.T. Case No. 13225. U. S. Patent Application Serial No. 12/437,818. Filed on May 8 (2009).
  • Qing Hu and Benjamin S. Williams, “Terahertz Lasers and Amplifiers Based on Resonant Optical Phonon Scattering to Achieve Population Inversion,” U. S. Patent No. 7,548,566, issued on June 16, 2009.
  • Qing Hu, “Tunable Wire Laser,” M.I.T. Case No. 14031 (2009). Provisional patent application was filed with the United States Patent and Trademark Office on November 3, 2009.
  • Q. Hu, “Terahertz quantum cascade lasers and video-rate THz imaging,” International Workshop on Optical Terahertz Science and Technology 2009 (OTST 2009), Santa Barbara, CA, March 7-11, (2009). (Invited)
  • S. Kumar, Q. Hu, J. L. Reno, “Low-Threshold Terahertz Quantum-Cascade Lasers with One-Well Injector Operating up to 174K,” CLEO/IQEC 2009, CThH4, Baltimore, Maryland, June 4 (2009).
  • Alan W. M. Lee, Q. Qin, S. Kumar, Q. Hu, J. L. Reno, “Frequency-Tunable External Cavity Terahertz Quantum Cascade Laser,” CLEO/IQEC 2009, CThH5, Baltimore, Maryland, June 4 (2009).
  • Allen L. Hsu, Q. Hu, and B. S. Williams, “Four-Well Highly Strained Quantum Cascade Lasers Grown by Metal-Organic Chemical Vapor Deposition,” CLEO/IQEC 2009, CThL2, Baltimore, Maryland, June 4 (2009).
  • Q. Hu, “Terahertz quantum cascade lasers and video-rate THz imaging,” 2009 Advanced Research Workshop (FTM-6), Future Trends in Microelectronics: Unmapped Roads, Sardinia, Italy, June 14-19 (2009). (Invited)
  • Q. Hu, “Terahertz quantum cascade lasers and video-rate THz imaging,” Device Research Conference (DRC), Penn State University, June 22-24, (2009). (Invited)
  • Sushil Kumar, I. Chan, Q. Hu, and J. L. Reno, “Terahertz Quantum-Cascade Lasers with Resonant-Phonon Depopulation,” the 10th International Conference on Intersubband Transitions in Quantum Wells (ITQW’09), Montreal, Canada, September 6-11 (2009). (Invited)
  • P. Khorsropanah, A. Baryshev, W. Zhang, W. Jelleman, J. N. Hovenier, J. R. Gao, T. M. Klapwijk, D. G. Paveliev, S. Kumar, B. S. Williams, Q. Hu, J. L. Reno, B. Klein, and J. L. Hesler, “Phase-locking of a 2.7-THz quantum cascade laser to a microwave reference,” the 10th International Conference on Intersubband Transitions in Quantum Wells (ITQW’09), Montreal, Canada, September 6-11 (2009).
  • C. A. Wang, A. K. Goyal, R. K. Huang, J. P. Donnelly, D. R. Calawa, G. W. Turner, A. Sanchez-Rubio, A. Hsu, Q. Hu, and B. S. Williams, “GaInAs/AlInAs/InP Quantum Cascade Laser Materials,” the 17th American Conference on Crystal Growth and Epitaxy (17th ACCGE), Lake Geneva, Wisconsin, August 9-14 (2009).
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Real-time THz Imaging,” ECE seminar, Texas Tech University, Lubbock, TX, October 16 (2009). (Invited)
  • Q. Hu, “Tunable THz lasers,” TERA-MIR 2009, Turunç-Marmaris, Turkey, November 4 (2009). (Invited)
  • Q. Hu, “Terahertz quantum cascade lasers and video-rate THz imaging”, Shenzhen International Conferences on Advanced Science and Technology (SICAST), Shenzhen, China, November 15-20 (2009). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Real-time THz Imaging,” ECE Colloquium, University of Illinois at Urbana-Champaign, IL, December 3 (2009). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Real-time THz Imaging,” ECE Seminar, Northwestern University, Evanston, IL, December 4 (2009). (Invited)
  • Q. Hu, “Tunable THz lasers,” Advanced Workshop on ‘Frontiers in Electronics’ (WOFE). Rincon, Puerto Rico December 13-16, (2009).

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2008

  • Sushil Kumar and Alan W. M. Lee, “Resonant-Phonon Terahertz Quantum-Cascade Lasers and Video-Rate Terahertz Imaging,” IEEE Journal of Quantum Electronics, 14, 333 (2008). (Invited) [PDF]
  • G. Scamarcio, M. S. Vitiello, V. Spagnolo, S. Kumar, B. S. Williams, and Q. Hu, “Nanoscale heat transfer in quantum cascade lasers,” Physica E 40, 1780 (2008). [PDF]
  • S. Kumar, A. W. M. Lee, Q. Qin, B. S. Williams, Q. Hu, and J. L. Reno, “High-temperature and high-power operation of terahertz quantum-cascade lasers,” SPIE Proceedings (2008).
  • S. Kumar, A. W. M. Lee, Q. Qin, B. S. Williams, Q. Hu, and J. L. Reno, “High-temperature and high-power operation of terahertz quantum-cascade lasers,” IEEE Phonoics West, San Jose, CA, 19 – 24 January (2008). (Invited)
  • Q. Hu, “Resonant phonon-based THz quantum-cascade lasers and real-time T-rays imaging”, International Quantum Cascade Lasers School & Workshop Monte Verita, Switzerland, September 14-19 (2008). (Invited)
  • S. Kumar, Q. Hu, and J. L. Reno, “Bidirectional Terahertz Quantum-Cascade Lasers”, International Quantum Cascade Lasers School & Workshop Monte Verita, Switzerland, September 14-19 (2008).
  • Alan W.M. Lee, Sushil Kumar, Ben Williams, Qing Hu, and John L. Reno, “Tunable THz QCLs”, International Quantum Cascade Lasers School & Workshop Monte Verita, Switzerland, September 14-19 (2008).
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Real-time THz Imaging “, International Workshop “THz Radiation: Basic Research and Applications” (TERA 2008), Alushta, Crimea, Ukraine, October 2 – 4, (2008). (Invited)
  • A. Wade, G. Fedorov, D. Smirnov, S. Kumar, Q. Hu, B. S. William, “Magnetic field controlled sub-THz emission in Quantum Cascade Lasers,” APS March Meeting, March (2008).
  • Q. Hu, “Terahertz Quantum Cascade Lasers and Real-time THz Imaging,” SUNY at Buffalo EE colloquium, October 23 (2008).
  • Q. Hu, “THz Quantum Cascade Lasers and sub-surface T-rays Imaging at Video Rate,” Terahertz Imaging and Spectroscopy Workshop, Northeastern University, Boston, October 30 (2008). (invited)

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2007

  • Sushil Kumar, B. S. Williams, Q. Qin, A. W. M. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Optics Express, 15, 113-128 (2007). [PDF]
  • Alan Wei Min Lee, Qi Qin, Sushil Kumar, Benjamin S. Williams, Qing Hu, John L. Reno, “High-power and high-temperature THz quantum-cascade lasers based on lens-coupled metal-metal waveguides”, Optics Letters, 32, 2840 (2007). [PDF]
  • V. Spagnolo, M. S. Vitiello, G. Scamarcio, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Hot-phonon generation in THz quantum cascade lasers,” Journal of Physics: Conference Series 92, 012018 (2007). [PDF]
  • Q. Hu, B. S. Williams, S. Kumar, A. W. M. Lee, Q. Qin, J. L. Reno, H. C. Liu, and Z. R. Wasilewski, “Terahertz Quantum Cascade Lasers and Real-time T-ray Imaging,” Future Trends in Microelectronics, Eds. Serge Luryi, Jimmy Xu, Alex Zaslavsky, pp. 347-358, John Wiley & Sons, New York (2007).
  • Qing Hu and Benjamin S. Williams, “Terahertz Lasers and Amplifiers Based on Resonant Optical Phonon Scattering to Achieve Population Inversion,” U. S. Patent No. 7,158,545, issued on January 2, 2007.
  • B. S. Williams, “High-temperature and high-power quantum cascade lasers,” IEEE Phonoics West, San Jose, CA, January 23 (2007). [6485-21] (Invited)
  • Q. Hu, “Terahertz quantum cascade lasers and real-time T-rays imaging,” Electrical and Computer Engineering seminar, University of Wisconsin, Madison, April 23 (2007). (Invited)
  • Benjamin Williams, Sushil Kumar, Qi Qin, Alan Wei Min Lee, Qing Hu, John L. Reno, Z. R. Wasilewski, H. C. Liu, “Terahertz Quantum Cascade Lasers”, CLEO/QELS 2007, Baltimore, Maryland, May 9 (2007). (Invited)
  • Alan W. M. Lee, Qi Qin, Sushil Kumar, Benjamin S. Williams, Qing Hu, John L. Reno, “High-Power Metal-Metal Waveguide Terahertz Quantum-Cascade Laser with a Hyperhemispherical Lens,” CLEO/QELS 2007, Baltimore, Maryland, May 9 (2007).
  • Sushil Kumar, Qi Qin, Benjamin S. Williams, Qing Hu, Zbig R. Wasilewski, Xiaohua Wu, Hui C. Liu, “Quantum-Cascade Lasers with One-Well Injector Operating at 1.59 THz (λ = 188.5 μm),” CLEO/QELS 2007, Baltimore, Maryland, May 9 (2007).
  • Alan W.M. Lee, Qi Qin, Sushil Kumar, Benjamin S. Williams, Qing Hu, John L. Reno, “Real-Time, Transmission-Mode, Terahertz Imaging over a 25-Meter Distance,” CLEO/QELS 2007, Baltimore, Maryland, May 10 (2007).
  • Sushil Kumar, Benjamin S. Williams, Qi Qin, Alan W. M. Lee, Qing Hu, John L. Reno, “Single-Mode Surface-Emitting Terahertz Quantum Cascade Lasers Operating up to ~ 150 K,” CLEO/QELS 2007, Baltimore, Maryland, May 9 (2007).
  • Q. Hu, “Terahertz quantum-cascade lasers and real-time T-rays imaging,” 12th Optoelectronics and Communications Conference, 16th International Conference on Integrated Optics and Optical Fiber Communication,” Yokohama, Japan, July 9-13 (2007). (Invited)
  • V. Spagnolo, M. S. Vitiello, G. Scamarcio, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Hot-phonon generation in THz quantum cascade lasers,” PHONONS2007, July 15-20 (2007).
  • Q. Hu, “Terahertz quantum-cascade lasers and real-time T-rays imaging,” the International Symposium “Topical Problems of Biophotonics-2007”, Novgorod-Moscow, Russia, August 4-11 (2007). (Invited)
  • Q. Hu, “Terahertz quantum-cascade lasers and video-rate THz imaging,” IRMMW-THz2007, Cardiff, UK, September 2-7 (2007). (Invited Plenary Talk)
  • T. O. Klaassen, J. N. Hovenier, A. J. L. Adam, A. Baryshev, J. R. Gao, T. M. Klapwijk, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “How to manipulate the frequency of a THz QCL?,” IRMMW-THz2007, Cardiff, UK, September 2-7 (2007).
  • Q. Hu, “Terahertz quantum cascade lasers and real-time THz imaging,” The 20th Annual Meeting of the IEEE Lasers & Electro-Optics Society (IEEE/LEOS 2007), Orlando, FL, October 21-25, (2007). (Invited)
  • Gaetano Scamarcio, Miriam S. Vitiello, Vincenzo Spagnolo, Sushil Kumar, Benjamin Williams, and Qing Hu, “Nanoscale heat transfer in quantum cascade lasers,” presented at the 13th International Conference on Modulated Semiconductor structures (MSS-13) Genova, Italy, July 15 – 20, 2007. (Invited) Manuscript will be published in Physica E (2007).
  • A. Wade, G. Fedorov, D. Smirnov, B.S. Williams, and Q. Hu, “LO-phonon assisted injection observed in a THz Quantum Cascade Laser,” the 9th International Conference on Intersubband Transitions in Quantum Wells (ITQW’07), Ambleside, Cumbria, U.K., September 9-14, (2007).
  • S. Kumar, B. S. Williams, Q. Qin, A. W. M. Lee, Q. Hu, J. L. Reno, Z. R. Wasilewski, and H. C. Liu, “Terahertz quantum-cascade lasers with resonant-phonon depopulation: high-temperature and low-frequency operation,” the 9th International Conference on Intersubband Transitions in Quantum Wells (ITQW’07), Ambleside, Cumbria, U.K., September 9-14, (2007).
  • Q. Hu, “THz quantum-cascade lasers and video-rate THz imaging,” Photonics Asia, November 11 – 15 (2007), Beijing China. (Invited)
  • Q. Hu, “Terahertz quantum cascade lasers for video-rate THz imaging,” Advanced Workshop on ‘Frontiers in Electronics’ (WOFE) December 15-19, 2007 Cozumel, Mexico.

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2006

  • E. E. Orlova, J. N. Hovenier, T. O. Klaassen, I. Kasalynas, A. J. L. Adam, A. Baryshev, J. R. Gao, T. M. Klapwijk, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Antenna Model for Wire Lasers,” Phys. Rev. Lett. 96, 173904 (2006). Also published in the May 29, 2006 issue of Virtual Journal of Nanoscale Science & Technology. [PDF]
  • B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “High-power terahertz quantum-cascade lasers,” Elect. Lett. 42, 89 (2006). Also reported in Compound Semiconductor, page 32, March (2006). [PDF]
  • A. J.L. Adam, I. Kašalynas, J.N. Hovenier, T.O. Klaassen, J.R. Gao, E.E. Orlova, B.S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam pattern of Terahertz quantum cascade lasers with sub-wavelength cavity dimensions,” Appl. Phys. Lett. 88, 151105 (2006). Also published in Virtual Journal of Nanoscale Science & Technology, 13(16), April 26 (2006). [PDF]
  • S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “1.9-THz quantum-cascade lasers with one-well injector,” Appl. Phys. Lett. 88, 121123 (2006). [PDF]
  • Alan W.M. Lee, Benjamin S. Williams, Sushil Kumar, Qing Hu, and John L. Reno, “Real-Time Imaging using a 4.3-THz Quantum Cascade Laser and a 320´240 Microbolometer Focal-Plane Array,” IEEE Photonics Technology Letters 18, 1415 (2006). [PDF]
  • A. Baryshev, J. N. Hovenier, A. J. L. Adam, I. Kasalynas, J. R. Gao, T. O. Klaassen, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laser,” Appl. Phys. Lett. 89, 031115 (2006). [PDF]
  • B. S. Williams, S. Kumar, Q. Qin, Q. Hu, and J. L. Reno, “Terahertz quantum cascade lasers with double resonant-phonon depopulation,” Appl. Phys. Lett. 88, 261101 (2006). [PDF]
  • Alan W.M. Lee, Qi Qin, Sushil Kumar, Benjamin S. Williams, Qing Hu, and John L. Reno, ‘Real-Time Terahertz Imaging over a Standoff Distance (>25 meters),” Appl. Phys. Lett. 89, 141125 (2006). [PDF]
  • Q. Hu, “Terahertz quantum-cascade lasers and real-time T-rays imaging”, IEEE Phonoics West, San Jose, CA, January 23 (2006). [6127-08] (Invited)
  • Q. Hu, “Terahertz quantum-cascade lasers as local oscillators,” 17th International Symposium on Space Terahertz Technology (ISSTT 2006), Paris, France, May 10-12 (2006).
  • Abigail Hedden, Patrick Pütz, Dathon Golish, Christopher Groppi, and Christopher Walker, Benjamin Williams, Qing Hu, and John Reno, “Micromachined Spatial Filters for Quantum Cascade Lasers,” 17th International Symposium on Space Terahertz Technology (ISSTT 2006), Paris, France, May 10-12 (2006).
  • M. Hajenius, J.N. Hovenier, Z.Q. Yang, A. Baryshev, J.J.A. Baselmans, J.R. Gao, T.M. Klapwijk, B.S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Heterodyne receiver based on hot electron bolometer and quantum cascade laser for detection of the OH line at 3.5 THz,” 17th International Symposium on Space Terahertz Technology (ISSTT 2006), Paris, France, May 10-12 (2006).
  • Benjamin S. Williams, Sushil Kumar, Qing Hu, John L. Reno, “High-Power Terahertz Quantum Cascade Lasers,” session CTuT2, CLEO/QELS 2006, Long Beach, CA, May (2006).
  • Sushil Kumar, Benjamin S. Williams, Qing Hu, John L. Reno, “Long Wavelength Terahertz Quantum-Cascade Lasers With One-Well Injector,” session CTuT4, CLEO/QELS 2006, Long Beach, CA, May (2006).
  • Alan W. M. Lee, Sushil Kumar, Benjamin S. Williams, Qing Hu, John L. Reno, “Real-Time Imaging Using a 4.3-THz Quantum Cascade Laser and a 240´320 Element Focal-Plane Array,” session CMLL2, CLEO/QELS 2006, Long Beach, CA, May (2006).
  • Q. Hu, “Terahertz quantum cascade lasers and real-time T-rays imaging,” presented at 2006 Advanced Research Workshop on Future Trends in Microelectronics: Up the Nano Creek, Crete, Greece, June 26-30, (2006). (Invited)
  • Qing Hu, Alan W. M. Lee, Benjamin S. Williams, Sushil Kumar, and John L. Reno, “Real-time THz imaging using quantum-cascade lasers and focal-plane array cameras,” Presented at 2nd International Workshop on Quantum Cascade Lasers, Brindisi, Italy, September 6-9 (2006). (Invited)
  • Benjamin S. Williams, Sushil Kumar, Qi Qin, Alan Lee, Qing Hu, and John L. Reno, “High-temperature and high-power THz quantum cascade lasers,” Presented at 2nd International Workshop on Quantum Cascade Lasers, Brindisi, Italy, September 6-9 (2006). (Invited)
  • Sushil Kumar, Benjamin S. Williams, Qi Qin, Qing Hu, John L. Reno, Z. R. Wasilewski, and H. C. Liu, “Long Wavelength and Surface-emitting Terahertz Quantum-Cascade Lasers,” Presented at 2nd International Workshop on Quantum Cascade Lasers, Brindisi, Italy, September 6-9 (2006). (Invited)
  • Q. Hu, “Terahertz quantum cascade lasers and real-time T-rays imaging,” IEEE Sensors 2006, Daegu, Korea, October 22-25 (2006). (Invited)
  • B. S. Williams, “THz Quantum Cascade Lasers,” IEEE LEOS’06 Conference, Montreal, Canada, October (2006). (Invited)

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2005

  • Q. Hu, B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, and J. L. Reno, “Resonant-phonon-assisted THz Quantum Cascade Lasers with Metal-metal Waveguides,” a Topical Issue on TERAHERTZ TECHNOLOGY, Journal of Semiconductor Science and Technology, 20, S228-S236 (2005). [PDF]
  • S. Kohen, B. S. Williams, and Q. Hu, “Electromagnetic modeling of terahertz quantum cascade laser waveguides and resonators,” J. Appl. Phys. 97, 053106 (2005). [PDF]
  • M. S. Vitiello, G. Scamarcio, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Measurement of subband electronic temperatures and population inversion in THz quantum cascade lasers,” Appl. Phys. Lett. 86, 111115 (2005). [PDF]
  • J. R. Gao, J. N. Hovenier, Z. Q. Yang, J. J. A. Baselmans, A. Baryshev, M. Majenius, T. M. Klapwijk, A. J. L. Adam, T. O. Klassen, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “A terahertz heterodyne receiver based on a quantum cascade laser and a superconducting bolometer,” Appl. Phys. lett. 86, 244104 (2005). Also published in Virtual Journal of Nanoscale Science & Technology, 11(24), June 20 (2005). [PDF]
  • H. C. Liu, M. Wächter, D. Ban, Z. R. Wasilewski, M. Buchanan, G. C. Aers, J. C. Cao, S. L. Feng, B. S. Williams, and Q. Hu, “Effect of doping concentration on the performance of terahertz quantum-cascade lasers,” Appl. Phys. Lett. 87, 141102 (2005). [PDF]
  • A. L. Betz, R. T. Boreiko, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Frequency and Phaselock Control of a 3-THz Quantum Cascade Laser,” Opt. Lett. 30, 1837 (2005). [PDF]
  • A. W. M. Lee and Q. Hu, “Real-Time, Continuous-Wave Terahertz Imaging using a Microbolometer Focal-Plane Array,” Opt. Lett. 30, 2563 (2005). Also reported in Opto&Laser Europe, page 14, December (2005). [PDF]
  • B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Operation of terahertz quantum-cascade lasers at 164 K in pulsed mode and at 117 K in continuous-wave mode,” Optics Express, 13, 3331-3339 (2005). Also published in Virtual Journal of Nanoscale Science & Technology, 11(25), June 27, (2005). [PDF]
  • B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Distributed-feedback terahertz quantum-cascade lasers using laterally corrugated metal waveguides,” Opt. Lett. 30, 2909 (2005). [PDF]
  • H. Callebaut and Q. Hu, “Importance of coherence for electron transport in terahertz quantum cascade lasers,” J. Appl. 98, 104505 (2005). Also published in Virtual Journal of Nanoscale Science & Technology, 12(24), December 12, (2005). [PDF]
  • H. C. Liu, H. Luo, D. Ban, M. Wächter, C. Y. Song, Z. R. Wasilewski, M. Buchanan, G. C. Aers, A. J. SpringThorpe, J. C. Cao, S. L. Feng, B. S. Williams, and Q. Hu, “Terahertz Semiconductor Quantum Well Devices,” Proc. of SPIE, 6029, 602901 (2005). [PDF]
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” 8th International Symposium on Contemporary Photonics Technology (CPT2005), Tokyo, Japan, January 13, (2005). (Invited)
  • B. S. Williams, S. Kohen, S. Kumar, Q. Hu, and J. L. Reno, “Terahertz quantum cascade lasers with metal-metal waveguides,” IEEE Phonoics West, San Jose, CA, January 25 (2005). Published in SPIE Proceedings, vol. xxx, yyy (2005). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” Princeton BMD/OOE seminar (Electronics Devices & Materials, Opto & Optoelectronics), Princeton University, NJ, March 7 (2005). (Invited)
  • A.J.L. Adam, J. N. Hovenier, and T.O. Klaassen, M. Hajenius, J.R. Gao, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Evaluation of a Quantum Cascade Laser as Local Oscillator for Heterodyne Detection of THz Radiation,” OSA topical meeting on Optical Terahertz Science and Technology, Orlando, FL, March 15, (2005).
  • B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Advances in Terahertz Quantum-Cascade Lasers Using Metal-metal Waveguides,” OSA topical meeting on Optical Terahertz Science and Technology, Orlando, FL, March 15, (2005).
  • A. Betz, R. T. Boreiko, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Frequency and Phaselock Control of a 3-THz Quantum Cascade Laser,” OSA topical meeting on Optical Terahertz Science and Technology, Orlando, FL, March 15, (2005).
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” Harvard EE seminar, Harvard University, MA, April 8 (2005). (Invited)
  • Q. Hu, “Terahertz Quantum-cascade lasers as local oscillators,” 16th International Symposium on Space Terahertz Technology (ISSTT 2005), Göteborg, Sweden, May 2-4 (2005). (Invited)
  • A.J.L. Adam, J.N. Hovenier, I. Kasalynas, T.O. Klaassen, J.R. Gao, B.S. Williams, S. Kumar, Q. Hu, E.E. Orlova, and J. L. Reno, “Near and Far Field Beam Pattern Measurements on Quantum Cascade Lasers Operating at 2.8 THz,” 16th International Symposium on Space Terahertz Technology (ISSTT 2005), Göteborg, Sweden, May 2-4 (2005).
  • Q. Hu, “Terahertz Devices,” Workshop On Compound Semiconductor Devices & Integrated Circuits in Europe (WOCSDICE2005), Cardiff, UK, May 15-18 (2005). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” CLEO/QELS 2005, Baltimore, Maryland, May 22-27 (2005). (Invited)
  • Miriam Serena Vitiello, Gaetano Scamarcio, Vincenzo Spagnolo, Benjamin S. Williams, Sushil Kumar, Qing Hu, and John L. Reno, “Hot electrons in resonant-phonon terahertz quantum cascade lasers,” CLEO/QELS 2005, Baltimore, Maryland, May 22-27 (2005).
  • Q. Hu, “High-temperature operation of THz quantum-cascade lasers,” CLEO Europe 2005, Munich, Germany, June 12-17 (2005). (Invited)
  • Q. Hu, “THz quantum cascade lasers,” 35th Workshop: Physics and Technology of THz Photonics, International School of Solid State Physics, Erice, Italy, July 20-26, (2005). (Invited)
  • H. C. Liu, H. Luo, D. Ban, M. Wächter, C. Y. Song, Z. R. Wasilewski, M. Buchanan, G. C. Aers, A. J. SpringThorpe, J. C. Cao, S. L. Feng, B. S. Williams, and Q. Hu, “THz Quantum Semiconductor Devices,” 20th Congress of the International Commission for Optics, Changchun, China, August 21-26 (2005).
  • T.O. Klaassen, A.J.L. Adam, N. Hovenier, I. Kasalynas, J-R. Gao, B.S. Williams, S. Kumar, Q. Hu, E. E. Orlova and J. L. Reno, “Optical beam profiles of Terahertz Quantum Cascade Lasers with a metal-metal waveguide: experiment and theory,” The 30th International Conference on Infrared and Millimeter Waves and the 13th IEEE International Conference on Terahertz Electronics (IRMMW-THz 2005), Williamsburg, VA, September 19-23, (2005).
  • Jian-Rong Gao, T.O. Klaassen, A.J.L. Adam, N. Hovenier, I. Kasalynas, B.S. Williams, S. Kumar, Q. Hu, E. E. Orlova and J. L. Reno, “A compact heterodyne receiver at 2.8 THz based on a quantum cascade laser and a superconducting bolometer,” The 30th International Conference on Infrared and Millimeter Waves and the 13th IEEE International Conference on Terahertz Electronics (IRMMW-THz 2005), Williamsburg, VA, September 19-23, (2005).
  • Miriam Serena Vitiello, Gaetano Scamarcio, Vincenzo Spagnolo, Benjamin S. Williams, Sushil Kumar, Qing Hu, and John L. Reno, “Population inversion and thermal properties in resonant-phonon THz quantum cascade laser under CW and pulsed operation,” the International Conference on Matter Material and Devices, June 27-July 1, (2005).
  • S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “First-order edge-emitting and second-order surface-emitting distributed feedback terahertz quantum cascade lasers,” the 8th International Conference on Intersubband Transitions in Quantum Wells (ITQW’05), Cape Cod, MA, September 11-16, (2005).
  • B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “High temperature operation of terahertz quantum-cascade lasers,” the 8th International Conference on Intersubband Transitions in Quantum Wells (ITQW’05), Cape Cod, MA, September 11-16, (2005).
  • H. Callebaut and Q. Hu, “Importance of dephasing in electron transport in THz quantum-cascade lasers,” the 8th International Conference on Intersubband Transitions in Quantum Wells (ITQW’05), Cape Cod, MA, September 11-16, (2005).
  • M. S. Vitiello, Gaetano Scamarcio, Vincenzo Spagnolo, Benjamin S. Williams, Sushil Kumar, Qing Hu, and John L. Reno, “Subband electronic temperatures in THz quantum cascade lasers under continuous wave and pulsed operation,” the 8th International Conference on Intersubband Transitions in Quantum Wells (ITQW’05), Cape Cod, MA, September 11-16, (2005).
  • Q. Hu (delivered by B. S. Williams), “Terahertz quantum cascade lasers,” IEEE LEOS Terahertz Systems Workshop, Boston, MA, November 9 (2005). (invited)
  • Q. Hu, “Terahertz quantum-cascade lasers,” International Workshop on Terahertz Technology (TeraTech’05), Osaka, Japan, November 17 (2005). (invited)

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2004

  • H. Callebaut, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “Importance of electron-impurity scattering for electron transport in THz quantum-cascade lasers,” Appl. Phys. Lett. 84, 645 (2004). [PDF]
  • S. Kumar, B. S. Williams, S. Kohen, Q. Hu, and J. L. Reno, “Continuous-wave operation of terahertz quantum-cascade lasers above liquid-nitrogen temperature,” Appl. Phys. Lett. 84, 2494 (2004). [PDF]
  • B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Resonant-phonon terahertz quantum-cascade laser operating at 2.1 THz (l ≈ 141 µm),” Elect. Lett. 40, 431 (2004). [PDF]
  • Q. Hu, B. S. Williams, S. Kumar, H. Callebaut, and J. L. Reno, “Terahertz quantum cascade lasers based on resonant phonon scattering for depopulation,” Phil. Trans. R. Soc. London A362, 233-249 (2004). [PDF]
  • J. Montoya and Q. Hu, “LT-GaAs Coplanar Waveguide Single Photon/Two Photon Absorption Autocorrelator,” J. Appl. Phys. 95, 2230 (2004). Also published in Virtual Journal of Ultrafast Science, March (2004). [PDF]
  • Hu, Q., B. S. Williams, S. Kumar, H. Callebaut, and J. L. Reno, “Phonon-Depopulated THz Quantum Cascade Lasers,” pp. 319-329, Future Trend in Microelectronics: The Nano, the Giga, and the Ultra, S. Luryi, J. Xu, A. Zaslavsky, eds., John Wiley & Sons, New York, 2004.
  • Q. Hu, “Resonant-phonon-assisted THz quantum-cascade lasers using metal-metal waveguides for mode confinement,” International Workshop on Quantum Cascade Lasers, Servile, Spain, January 4-7, (2004). (Invited)
  • B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Terahertz quantum cascade lasers using resonant-phonon depopulation and metal-metal waveguides,” IEEE Phonoics West, San Jose, CA, January 27 (2004). Published in SPIE Proceedings, vol. xxx, yyy (2004). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” DOE-NSF-NIH Workshop on Opportunities in THz Science, February 12-14, 2004, Sheraton National Hotel – Arlington, VA.
  • Hu, Q., “Terahertz Quantum-cascade Lasers,” presented at the 2004 APS March meeting in session Y2.004, Montreal, Canada, March (2004). (Invited)
  • A.L. Betz, R.T. Boreiko, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “A Phase-locked Terahertz Quantum Cascade Laser,” presented at the 15th International Symposium on Space Terahertz Technology, Northampton, Massachusetts, April (2004), published in the symposium proceedings, pp (2004).
  • Hu, Q., “Terahertz Quantum-cascade Lasers,” presented at the 2nd International Symposium on Ultrafast Phenomena and Terahertz Waves, Shanghai, China, May (2004). (Invited)
  • B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Resonant-phonon terahertz quantum cascade lasers at long wavelengths,” session CMZ1, CLEO/QELS 2004, San Francisco, CA, May (2004).
  • S. Kumar, B. S. Williams, S. Kohen, Q. Hu, and J. L. Reno, “High temperature continuous-wave operation of terahertz quantum cascade lasers,” session CMZ2, CLEO/QELS 2004, San Francisco, CA, May (2004).
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” presented at the 6th International Conference on Mid-infrared Optoelectronics Materials and Devices (MIOMD-VI), St. Petersburg, Russia, June (2004). (Invited)
  • Miriam S. Vitiello, Vincenzo Spagnolo, Gaetano Scamarcio, Cinzia Di Franco, Benjamin S. Williams, Sushil Kumar, Qing Hu, John. L. Reno, “Electronic and lattice temperatures of terahertz quantum cascade lasers based on phonon-assisted depopulation,” presented at the 6th International Conference on Mid-infrared Optoelectronics Materials and Devices (MIOMD-VI), St. Petersburg, Russia, June (2004).
  • Miriam S. Vitiello, Vincenzo Spagnolo, Gaetano Scamarcio, Cinzia Di Franco, Michele Sibilano, Benjamin S. Williams, Sushil Kumar, Qing Hu, John. L. Reno, “Measurement of the electron – lattice coupling in terahertz quantum cascade lasers,” presented at INFMeeting 2004, Italy, June (2004).
  • B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Resonant-phonon terahertz quantum cascade lasers using metal-metal waveguides,” The 29th International Conference on Infrared and Millimeter Waves and the 12th IEEE International Conference on Terahertz Electronics (IRMMW2004/THz2004), Karlruhe, Germany, September 27, (2004). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” 2004 Workshop on Frontiers in Electronics (WOFE’04), Aruba, December 21 (2004).

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2003

  • B. S. Williams, H. Callebaut, S. Kumar, Q. Hu, and J. L. Reno, “3.4-THz quantum cascade laser based on LO-phonon scattering for depopulation,” Appl. Phys, Lett. 82, 1015 (2003). Also published in Virtual Journal of Nanoscale Science & Technology, 7(8), February 24 (2003). [PDF]
  • B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “3.4 THz quantum cascade laser operating above liquid nitrogen temperature,” Electro. Lett. 39, 915 (2003). [PDF]
  • H. Callebaut, S. Kumar, B. S. Williams, and J. L. Reno, “Analysis of transport and thermal properties of THz quantum cascade lasers,” Appl. Phys. Lett. 83, 207 (2003). [PDF]
  • B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum cascade laser at l ≈ 100 µm using metal waveguide for mode confinement,” Appl. Phys. Lett. 83, 2124 (2003). [PDF]
  • B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz Quantum Cascade Lasers Operating up to 137 K,” Appl. Phys. Lett. 83, 5142 (2003). [PDF]
  • Q. Hu, “Generation of Terahertz Emission Based on Intersubband Transitions,” pp. 57-86, Advanced Semiconductor Heterostructures: Novel Devices, Potential Device Applications and Basic Properties, International Journal of High Speed Electronics and Systems, Vol. 12, No. 4, M. Dutta, and M. A. Stroscio, eds., World Scientific, Singapore, (2003).
  • Benjamin S. Williams, Hans Callebaut, Sushil Kumar, Qing Hu, and John L. Reno, “Terahertz quantum cascade laser based on direct LO-phonon-scattering depopulation,” presented at the 2003 APS March meeting in session X8.013, Austin, TX, March (2003).
  • Q. Hu, Benjamin S. Williams, Hans Callebaut, Sushil Kumar, and John L. Reno, “Terahertz quantum cascade laser based on LO-phonon-scattering assisted depopulation,” presented at the 14th International Symposium on Space Terahertz Technology, Tucson, AZ, April (2003).
  • B. S. Williams, “Development of THz quantum-cascade lasers”, 33rd Winter Colloquium on The Physics of Quantum Electronics, Snowbird, Utah, January 7, (2003). (Invited)
  • M. N. Gurnee, L. D. Kimball, and Q. Hu, “Characterization of VOx as a High Performance Microbolometer Detector,” presented at 2003 Meeting of the Military Sensing Symposia (MSS) Specialty Group on Detectors, Tucson, Arizona, February 24-28, (2003), published in the symposium proceedings.
  • Q. Hu, Benjamin S. Williams, Hans Callebaut, Sushil Kumar, and John L. Reno, “Terahertz quantum cascade laser based on LO-phonon-scattering assisted depopulation,” presented at SPIE Aerosense Symposium, Orlando, FL, April (2003). (Invited)
  • B. S. Williams, H. Callebaut, S. Kumar, Q. Hu, and J. L. Reno, “Terahertz quantum cascade laser based on LO-phonon-scattering assisted depopulation,” CLEO/QELS 2003, Baltimore, Maryland, June 1-6 (2003).
  • Q. Hu, “Terahertz quantum cascade lasers based on resonant phonon scattering for depopulation,” the Royal Society Scientific Discussion Meeting The terahertz gap: the generation of far-infrared radiation and its applications, London, UK, June 4-5 (2003). (Invited)
  • Q. Hu, “Terahertz Quantum Cascade Lasers Based on Resonant-Phonon-Scattering-Assisted Depopulation,” presented at 2003 Advanced Research Workshop Future Trends in Microelectronics: The Nano, the Giga, the Ultra, and the Bio, Corsica, France, June 23-27, (2003). (Invited)
  • B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz Quantum Cascade Lasers Based On Resonant-Phonon Depopulation And Using Metal-Metal Waveguides,” presented at the 5th International Conference on Intersubband Transitions in Quantum Wells (ITQW’03), Evolene, Switzerland, September (2003).
  • H. Callebaut, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “Analysis of transport properties of THz quantum cascade lasers,” presented at the 5th International Conference on Intersubband Transitions in Quantum Wells (ITQW’03), Evolene, Switzerland, September (2003).
  • Q. Hu, “Terahertz Quantum Cascade Lasers,” Chinese Physical Society Fall Meeting, Hefei, China, September 18-20, (2003). (Invited Plenary Talk)
  • Q. Hu, “THz quantum cascade lasers based on resonant phonon scattering for depopulation,” The 11th IEEE International Conference on Terahertz Electronics (THz2003), Sendai, Japan, September 24-26, (2003). (Invited Plenary Talk)
  • Q. Hu, “THz quantum cascade lasers based on resonant phonon scattering for depopulation,” The 28th International Conference on Infrared and Millimeter Waves (IRMMW2003), Otsu, Japan, September 29 – October 3, (2003). (Invited Plenary Talk)
  • Q. Hu, “THz quantum cascade lasers based on resonant phonon scattering for depopulation,” The 16th Annual Meeting of the IEEE Lasers & Electro-Optics Society (IEEE/LEOS 2003), Tucson, AZ, October 26-30, (2003). (Invited)

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