Abstract
Optical constants of SixGe1-x alloys are modelled overthe spectral range from 0.7 eV to 5.6 eV for all compositions 0⩽x⩽1. The employed model is the modified Adachi's model, which utilizesvariable line broadening instead of the conventional Lorentzian one. Themodel takes into account transitions at the indirect band gap Egid,and critical points E0, E0 + Δ0, E1, E1 + Δ1,E0', E2(X), and E2(Σ). Excitonic effects are not considered. Themodel parameters are determined using a global optimization routine, namelyan acceptance-probability-controlled simulated annealing algorithm.Excellent agreement with the experimental data is obtained in the entireinvestigated energy and composition ranges. The obtained relative root meansquare errors are below 4.5% and 6.5% for the real and imaginary parts ofthe index of refraction, respectively.
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