Optical properties of bulk AlGaAs

An analytical semiempirical model is presented for the dielectric function epsilon (E) = epsilon(1)(E) + i epsilon(2)(E) of bulk AlGaAs. The imaginary part of the dielectric function epsilon(2)(E) is calculated based on a simplitied model of band structure and the real part of the dielectric function epsilon(1)(E) is calculated from epsilon(2)(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. (C) 1997 American Institute of Physics.