Generally speaking, our group studies the interesting behaviors of photons in the environment of nanoscopic structures, which can be drastically different from those in macroscopic systems. By studying these new physical effects, we can apply them to invent and design new optoelectronic devices, which we then fabricate and test in the lab. At this point, we focus on the following topics: 

– Topological photonics | A few examples of our recent projects include Floquet Chern insulators of light, synthesis of non-Abelian gauge fieldsobservation of bulk Fermi arcs, and topological nature of bound states in the continuum

– Non-Hermitian physics | Here are a few recent projects: observation of exceptional ring, light-matter interaction at exceptional points

– Bound states in the continuum | Here is a review paper we wrote on this topic, which includes most previous projects of ours.   

On the device side, we are most excited about demonstrating fundamentally new devices. A few examples include:  transparent displays, perfect single-side couplers, and low-threshold organic lasers