Modeling the optical constants of GaP, InP, and InAs

An extension of the Adachi model with the adjustable broadening function, i nstead of the Lorentzian one, is employed to model the optical constants of GaP, InP, and InAs. Adjustable broadening is modeled by replacing the damp ing constant with the frequency-dependent expression. The improved flexibil ity of the model enables achieving an excellent agreement with the experime ntal data. The relative rms errors obtained for the refractive index equal 1.2% for GaP, 1.0% for InP, and 1.6% for InAs. (C) 1999 American Institute of Physics. [S0021-8979(99)05807-7].