Robust design of Si/Si3N4 high contrast grating mirror for mid-infrared VCSEL application

TL;DR

This paper presents a robust design of a Si/Si3N4 high contrast grating mirror optimized for mid-infrared VCSELs, emphasizing fabrication tolerance and high reflectivity bandwidth.

Contribution

It introduces an optimization method for designing a VCSEL mirror with enhanced robustness and tolerance to fabrication errors.

Findings

Achieved large high reflectivity bandwidth

Enhanced robustness against fabrication errors

Maintained polarization selectivity with tolerance

Abstract

A Si/Si3N4 high contrast grating mirror has been designed for a VCSEL integration in mid-infrared ({\lambda} = 2.65 $\mu$m). The use of an optimization algorithm which maximizes a VCSEL mirror quality factor allowed the adjustment of the grating parameters while keeping large and shallow grating pattern. The robustness with respect to fabrication error has been enhanced thanks to a precise study of the grating dimension tolerances. The final mirror exhibits large high reflectivity bandwidth with a polarization selectivity and several percent of tolerance on the grating dimensions.