THE INFRARED OPTICAL PROPERTIES OF AL0.5IN0.5SB ALLOY WITH NANO COATINGS

Abstract

In this article, the SiC/Nano GaAs and SiC/Nano InP coatings on Al0.5In0.5Sb alloy are investigated in a theoretical framework. A Special program code written by MATLAB version 10 was performed to describe the reflectivity of coatings as a function of the nano-particles sizes, refractive index, and energy gap. This program is based on the Brus model and the Characteristic Matrix Theory. The results connected with nano-particle size of 3.6 nm in multilayer coatings indicate that our designs achieve high reflectivity. Such as, with six layers, the Air/SiC/Nano GaAs/Al0.5In0.5Sb design gives the reflectivity for S-Polarization Rs=99.9% and for P-Polarization Rp=98.0% for oblique incidence of 𝜃=45° and R=99.9% for the perpendicular incidence. Similarly, the Air/SiC/Nano InP/Al0.5In0.5Sb gives Rs=99.9% and Rp=98.5% for oblique incidence of 𝜃=45° and R=99.8% for the perpendicular incidence. This study set out with the aim of assessing the importance of Air/SiC/Nano GaAs/Al0.5In0.5Sb composition in industrial applications as a highly reflective coating for CO2 laser resonators in the far infrared region