OPTICAL-CONSTANTS OF ALXGA1-XAS

A simple, analytical, semiempirical model is presented for the optical constants of AlxGa1-xAs including the index of refraction. The model is tailored to the energy range of 1.0-3.0 eV, the operating range for many AlxGa1-xAs-based devices and incorporates the important electronic transitions in the solid which affect light propagation and absorption. The parameters of the model are simple functions of composition allowing for ready computation of any of the optical constants, n, k, α, ε1, or ε2, for any energy E (or wavelength λ) of light between 1.0 and 3.0 eV (400-1200 nm) and any composition x.