Parametrization of the Optical Constants of AlAsxSb1-x Alloys in the Range 0.74-6.0 eV

Tae Jung Kim, Jun Seok Byun, Nilesh Barange, Han Gyeol Park, Yu Ri Kang, Jae Chan Park, Young Dong Kim
2014 Journal of the Optical Society of Korea  
We report parameters that allow the dielectric functions ε = ε 1 + iε 2 of AlAs x Sb 1-x alloys to be calculated analytically over the entire composition range 0 ≤ x ≤ 1 in the spectral energy range from 0.74 to 6.0 eV by using the dielectric function parametric model (DFPM). The ε spectra were obtained previously by spectroscopic ellipsometry for x = 0, 0.119, 0.288, 0.681, 0.829, and 1. The ε data are successfully reconstructed and parameterized by six polynomials in excellent agreement with
more » ... ent agreement with the data. We can determine ε as a continuous function of As composition and energy over the ranges given above, and ε can be converted to complex refractive indices using a simple relationship. We expect these results to be useful for the design of optoelectronic devices and also for in situ monitoring of AlAsSb film growth.
doi:10.3807/josk.2014.18.4.359 fatcat:uvaorufshrfcrdq7jwzyzfwdei