High-reflectivity broadband distributed Bragg reflector lattice matched to ZnTe

TL;DR

This paper demonstrates a high-quality, broadband distributed Bragg reflector lattice matched to ZnTe, achieved through molecular beam epitaxy using binary compounds, with high reflectivity and a broad stopband.

Contribution

It introduces a novel lattice-matched DBR structure with high reflectivity and broad stopband using only binary compounds and triple superlattice layers.

Findings

Reflectivity exceeds 99% with 15 Bragg pairs

Broad stopband achieved due to high refractive index contrast

Structure grown by molecular beam epitaxy on 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 Delta_n=0.5 in the structure results in a broad stopband and the reflectivity coefficient exceeding 99% for only 15 Bragg pairs.