Photonic Crystal Nanocavity Arrays

摘要

We recently proposed two-dimensional coupled photonic crystal nanocavity arrays as a route to achieve a slow-group velocity of light in all crystal directions, thereby enabling numerous applications ranging from low- threshold nonlinear optics to improved lasers. In this article, we review some of our recent experimental results on such structures, ranging from tile measurement of group velocities below 0.008c to a new type of laser composed of an array of coherently coupled photonic crystal nanocavities. We show that such lasers exhibit a high differential quantum efficiency and output power, together with a low threshold power comparable to those of single photonic crystal cavity lasers. The measured laser efficiency increases faster than the lasing threshold with an increase in the number of coupled cavities and enables single mode lasing with output powers that are two orders of magnitude higher than in single nanocavity lasers.