Fabrication and Characterization of Thermally Evaporated Omnidirectional Mirrors

Omnidirectional mirrors based on chalcogenide and cryolite were fabricated by thermal evaporation. These mirrors are characterized using a two-dimensional mapping that provides a direct, visual signature. These signatures are presented for different multilayer structures. A mirror with an omnidirectional reflectivity of more than 94% and with a transverse electric omnidirectional reflectivity of more than 99.99% for high-incident angles is demonstrated. A surface roughness of less than 5 nm was obtained.