Photonic crystal resonant surfaces

Photonic crystals are well known for confining light in a small space, most notably in high Q cavities that offer some of the highest ratio of quality factor over volume (Q/V) of any optical system, which is extremely useful for strong light matter interaction, nanolasers and quantum interactions. Very recently, photonic crystal cavities have been used to achieve lasing in 2D materials, which is a topic I will briefly touch upon. What is less well known, but equally powerful, is the ability of photonic crystals to excite and support surface modes. Such resonant photonic crystal surface modes are very useful in a range of applications, including solar cells, metasurfaces and optical biosensors. I will explain the different modalities of such resonant surfaces in light of our recent work in this area.