Physical Optics and Electronics Group
Prof. Rajeev Ram


  1. S. Moazeni, S. Lin, M. Wade, L. Alloatti, R. J. Ram, M. Popović, V. Stojanović, "A 40-Gb/s PAM-4 Transmitter Based on a Ring-Resonator Optical DAC in 45-nm SOI CMOS," IEEE Journal of Solid-State Circuits Vol: 52, Issue 12, Dec 2017 (2017) DOI: 10.1109/JSSC.2017.2748620 [PDF] Link to Publication
  2. J. Xue, Z. Li, R. J. Ram, "Irreversible Thermodynamic Bound for the Efficiency of Light-Emitting Diodes," American Physical Society, Physical Review Applied, 8, 014017 (2017) DOI: 10.1103/PhysRevApplied.8.014017 [PDF] Link to Publication
  3. K. Mehta, R.J. Ram, "Precise and diffraction-limited waveguide-to-free-space focusing gratings," Nature, Scientific Reports, 7, Article Number: 2019 (2017) (2017) DOI: 10.1038/s41598-017-02169-2 [PDF] Link to Publication
  4. A. Atabaki, H. Meng, L. Alloatti, K. Mehta, R. J. Ram, "High-speed polysilicon CMOS photodetector for telecom and Datacom," Applied Physics Letters (2016): 109, 111106 (2016), DOI: 10.1063/1.4962641 [PDF] Link to Publication
  5. L. Alloatti, R. J. Ram, "Infrared vertically-illuminated photodiode for chip alignment feedback," AIP Advances (2016): 6, 085219 (2016), DOI: 10.1063/1.4961949 [PDF] Link to Publication
  6. K. Mehta, C. Bruzewicz, R. McConnell, R. J. Ram, J. Sage, J. Chiaverini, "Integrated optical addressing of an ion qubit," Nature Nanotechnology (2016) DOI: 10.1038/NNANO.2016.139 [PDF] Link to Publication
  7. P. Perez-Pinera, N. Han, S. Cleto, J. Cao, O. Purcell, K. A. Shah, K. Lee, R. J. Ram, T. K. Lu, "Synthetic biology and microbioreactor platforms for programmable production of biologics at the point-of-care," Nature Communications (2016) DOI: 10.1038/ncomms12211 [PDF] Link to Publication
  8. N. Han, S. Cho, A. Atabaki, E. Ye, W. Herrington, R. J. Ram , "Non-paraxial Talbot Effect for Building Compact Spectrometers," Computational Optical Sensing and Imaging (COSI), Heidelberg, Germany (2016) [PDF] Link to Publication
  9. E. Ye, A. Atabaki, N. Han, R. J. Ram, "Miniature, sub-nanometer resolution Talbot spectrometer," Optics Letters, V. 41, 11 (2016): 2434-2437, [PDF] Link to Publication
  10. L. Alloatti, D. Cheian, R. J. Ram, "High-speed modulator with interleaved junctions in zero-change CMOS photonics," Applied Physics Letters, 108, 131101 (2016) DOI: 10.1063/1.4944999 [PDF] Link to Publication
  11. L. Alloatti, and R. J. Ram, "Resonance-enhanced waveguide-coupled silicon-germanium detector," Applied Physics Letters (2016): 108, 071105 , DOI: 10.1063/1.4941995 [PDF] Link to Publication
  12. C. Sun, M. Wade, Y. Lee, J. Orcutt, L. Alloatti, M. Georgas, A. Waterman, J. Shainline, R. Avizienis, S. Lin, R. Kumar, F. Pavanello, A. Atabaki, H. Cook, A. Ou, B. Moss, J. Leu, Y-H. Chen, K. Asanovic, R. Ram, M. Popovic, V. Stojanovic , "Single-Chip Microprocessor with Integrated Photonic I/O," Nature (2015): v. 528, pp 534–538, DOI: 10.1038/nature16454 [PDF] Link to Publication
  13. H. Meng, A. Atabaki, J. Orcutt, and R. Ram, "Sub-bandgap polysilicon photodetector in zero-change CMOS process for telecommunication wavelength," Optics Express (2015): 23, 32643-32653 , DOI: 10.1364/OE.23.032643 [PDF] Link to Publication
  14. J. Xue, Y. Zhao, S. Oh, W. Herrington, J. Speck, S. DenBaars, S. Nakamura, R. J. Ram, "Thermally enhanced blue light-emitting diode," Applied Physics Letters (2015): 107, DOI: 10.1063/1.4931365 [PDF] Link to Publication
  15. L Alloatti, SA Srinivasan, JS Orcutt, RJ Ram, "Waveguide-coupled detector in zero-change complementary metal–oxide–semiconductor," Appl. Phys. Lett. 107, 041104 (2015) DOI: [PDF] Link to Publication
  16. C Sun, M Wade, M Georgas , S Lin , L Alloatti , B Moss , R Kumar, A Atabaki , F Pavanello , R Ram , M Popović , V Stojanović , "A 45nm SOI Monolithic Photonics Chip-to-Chip Link with Bit-Statistics-Based Resonant Microring Thermal Tuning," VLSI Symposium (2015) [PDF] Link to Publication
  17. NJ Mozdzierz, KR Love, KS Lee, HLT Lee, KA Shah, R. J. Ram, J.C. Love, "A perfusion-capable microfluidic bioreactor for assessing microbial heterologous protein production," Lab on a Chip (2015): 15, 2918-2922, DOI: 10.1039/C5LC00443H [PDF] Link to Publication
  18. L Alloatti, M Wade, V Stojanovic, M Popovic, R J Ram, "Photonics design tool for advanced CMOS nodes," IET Optoelectronics, Vol. 9, Iss. 4, (2015): 163–167, DOI: 10.1049/iet-opt.2015.0003 [PDF] Link to Publication
  19. G. Singh, S. Goh, M. Canzoneri, R. J. Ram, "Raman Spectroscopy of Complex Defined Media: Biopharmaceutical Applications," Journal of Raman Spectroscopy (2015) DOI: 10.1002/jrs.4686 [PDF] Link to Publication
  20. C. Sun, M. Georgas, J. Orcutt, B. Moss, Y.-H. Chen, J. Shainline, M. Wade, K. Mehta, K. Nammari, E. Timurdogan, D. Miller, O. Tehar-Zahav, Z. Sternberg, J. Leu, J. Chong, R. Bafrali, G. Sandhu, M. Watts, R. Meade, M. Popovic, R. Ram, V. Stojanovic, "A Monolithically-Integrated Chip-to-Chip Optical Link in Bulk CMOS," IEEE J. of Solid-State Circuits 50.4 (2015): 828-844, DOI: 10.1109/JSSC.2014.2382101 [PDF] Link to Publication
  21. N. Han, O. Purcell, K. S. Lee, T. K. Lu, R. J. Ram, "Microfluidics for Control in Synthetic Biology," MicroTAS, San Antonio, TX (2014) [PDF] Link to Publication
  22. D. Huang, P. Santhanam, and R. J. Ram, "Low-Power Communication with a Photonic Heat Pump," Optics Express, 22, S7 (2014): A1650-58, [PDF] Link to Publication
  23. K. K. Mehta, A. M. Eltony, C. D. Bruzewicz, I. L. Chuang, R. J. Ram, J. M. Sage, and J. Chiaverini, "Ion Traps Fabricated in a CMOS Foundry," Applied Physics Letters 105, 044103 (2014) [PDF] Link to Publication
  24. K. K. Mehta, J. S. Orcutt, J. M. Shainline, O. Tehar-Zahav, Z. Sternberg, R. Meade, M. A. Popović, and R. J. Ram, "Polycrystalline Silicon Ring Resonator Photodiodes in a Bulk Complementary Metal-Oxide-Semiconductor Process," Optics Letters 39, 4 (2014): 1061-4, [PDF] Link to Publication
  25. W. Loh, S. Yegnanarayanan, R. J. Ram, P. Juodawlkis, "A Nonlinear Optoelectronic Filter for Electronic Signal Processing," Nature Scientific Reports 4, 3613 (2014) [PDF] Link to Publication
  26. D. Gray, Jr, P. Santhanam, R. J. Ram, "Design for Enhanced Thermo-Electric Pumping in Light Emitting Diodes," Applied Physics Letters 103.12 (2013): 123503, DOI: 10.1063/1.4821266 [PDF] Link to Publication
  27. S. Chen, S. Lee, H. Lo, Y. Hung, K. Lee, C. Tu, Y. Pan, R. J. Ram, "Silicon Platform with Vertically Aligned Carbon Nanotubes for Enhancing Thermal Conduction in Hybrid Optoelectronic Integration," IEEE Trans. Compon. Packag. Manuf. Technol. 2.7 (2012): 1128-34, [PDF] Link to Publication
  28. J. Bahk, P. Santhanam, Z. Bian, R. J. Ram, A. Shakouri, "Resonant Carrier Scattering by Core-Shell Nanoparticles for Thermoelectric Power Factor Enhancement," Applied Physics Letters 100 (2012) DOI: 10.1063/1.3673615 [PDF] Link to Publication