Optical Properties of III-Nitride Ternary Compounds

Abstract

Subject classification: 78.20.Ci; 78.66.Fd; S7.14 As a basic step in the evaluation of optical properties of the III-nitrides, the dielectric function of AlGaN and InGaN has been computed using the information from the full-band electronic structure in the framework of the random phase approximation. Both real and imaginary parts have been evaluated, and the refractive index has been compared with available parametrizations. Sellmeier coefficients for the refractive index at energies below the band gap have been derived as functions of the alloy composition.