Study of the Variation of the Optical Properties of Nano-GaAs Coating with Particle Size

Abstract

In this work, the optical properties of nano-GaAs coating are studied as a function of its particle size. Bulk Si is used as a basis for multi-layer optical re°ection of nano-GaAs coating. This study is done by using a program performed in Matlab software, aiming to calculate the variation in re°ectivity of the perpendicular and oblique incident light at wavelength of 1064 nm with particle size, refractive index and energy gap of the coated multi-layer. This program is based on the Brus model and characteristic matrix theory. The results show that the re°ectivity of Air/ Si/Nano-GaAs/Si design, with particle size Ps which equal is to 3.6 nm is (Rs ¼ 100%, Rp ¼ 99:8%), approximately for oblique incidence at 45 and R ¼ 99:98% for a perpendicular incidence. Given such a high re°ectivity gained by this design, this study makes a major contribution to the ¯eld of fabricating Nd-YAG laser resonators.