OPTICAL-CONSTANTS OF ZNSXSE1-X TERNARY ALLOYS

The methods for calculation of the various optical constants in ZnSxSe1-x ternary alloys are presented. The model used is based on an interpolation scheme, and the effects of alloy composition are properly taken into account in the calculation. The present model reveals distinct structures in the optical spectra at energies of the E0, E0 + DELTA0, E1, and E1 + DELTA1 gaps. The optical constants and properties considered here are the complex dielectric constant epsilon = epsilon1 + iepsilon2, complex refractive index n* = n + ik, absorption coefficient alpha, and normal-incidence reflectivity R. The refractive indices in the transparent region are also presented for a variety of waveguiding device applications.