Bo Zhen, Song-Liang Chua, Jeongwon Lee, Alejandro W. Rodriguez, Xiangdong Liang, Steven G. Johnson, John D. Joannopoulos, Marin Soljacic, and Ofer Shapira
The nature of light interaction with matter can be dramatically altered in optical cavities, often inducing non-classical behavior. In solid state systems, excitons need to be spatially incorporated within nanostructured cavities to achieve such behavior. While fascinating phenomena have been observed with inorganic nanostructures, the incorporation of organic molecules into the typically inorganic cavity is more challenging. Here we present a novel optofluidic platform comprising organic molecules in solution suspended on a photonic crystal surface, which supports macroscopic Fano resonances and allows strong and tunable interactions with the molecules anywhere along the surface. We develop the rst theoretical framework of this system and present a rigorous comparison with experimental measurements showing dramatic spectral and angular enhancement of emission. We then demonstrate that these enhancement mechanisms enable lasing of only 100 nm thin layer of diluted organic molecules solution with substantially reduced threshold intensity, which has important implications to organic light emitting devices and molecular sensing.