High-reflectivity broadband distributed Bragg reflector lattice matched to ZnTe

Abstract

We report on the realization of a high quality distributed Bragg reflector with both high and low refractive index layers lattice matched to ZnTe. Our structure is grown by molecular beam epitaxy and is based on binary compounds only. The high refractive index layer is made of ZnTe, while the low index material is made of a short period triple superlattice containing MgSe, MgTe, and ZnTe. The high refractive index step of Δn=0.5 in the structure results in a broad stop band and the reflectivity coefficient exceeding 99% for only 15 Bragg pairs.