An analytical semiempirical model is presented for the dielectric function ε(E)=ε1(E)+iε2(E) of bulk AlGaAs. The imaginary part of the dielectric function ε2(E) is calculated based on a simplified model of band structure and the real part of the dielectric function ε1(E) is calculated from ε2(E) by directly integrating the Kramers–Kronig relation. The discrepancy between the calculated refractive index and experimental data for GaAs is less than 0.4% for photon energies from 1.35 to 1.8 eV.
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Zheng et al. (1997) studied this question.
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