Optimized Si/SiO2 high contrast grating mirror design for mid-infrared wavelength range: robustness enhancement

TL;DR

This paper presents an optimized high contrast grating mirror design for mid-infrared wavelengths, achieving high robustness against fabrication errors and a broad bandwidth suitable for VCSEL applications.

Contribution

It introduces an automated optimization process that enhances the robustness and bandwidth of Si/SiO2 high contrast grating mirrors for mid-infrared use.

Findings

Robustness tolerance increased to 5-210%

Achieved a 250 nm bandwidth for the mirror

Design is scalable for different wavelengths

Abstract

A high reflectivity and polarization selective high contrast grating mirror has been designed with the use of an automated optimization algorithm. Through a precise study of the tolerance of the different lengths of the structure, the robustness with respect to the fabrication errors has been enhanced to high tolerance values between 5 % and 210 %. This adjustment of the dimensions of the structure leads to a 250 nm large bandwidth mirror well adapted for a VCSEL application at \lambda = 2.65 $\mu$m and can easily be scaled for other wavelengths.