Design, Fabrication and Characterization of Thermally Evaporated Photonic Crystal Mirrors.

In the present work, we design and fabricate omnidirectional mirrors based on 1D photonic crystals made of chalcogenide and cryolite using thermal evaporation. In particular, a two-dimensional mapping that provides a direct, visual signature of the mirrors is proposed. An experimental measurement of the reflectivity is shown. Finally a mirror with an omnidirectional reflectivity of more than 94% for a general polarization, a TE omnidirectional reflectivity of more than 99%, and a TE reflectivity of more than 99.99% for high incident angles is presented. The surface roughness of the mirrors is less than 5nm.