Abstract

The optical, vibrational, structural and elasto-optic properties of quaternary II-VI alloys Zn0.25Cd0.75S0.25Se0.75, Zn0.25Cd0.75S0.50Se0.50 and Zn0.25Cd0.75S0.75Se0.25 are presented. Within the empirical pseudopotential method (EPM) the disorder effects are modeled via modified virtual crystal approximation (MVCA). The computed bandgaps and the refined form factors are utilized to evaluate optical, vibrational, structural and elasto-optic properties. The refractive index (n), static (ε0) and high frequency dielectric (ε∞) constants are calculated to reveal optical behavior of alloys. The longitudinal ωLO(0) and transverse ωTO(0) optical frequencies are obtained to see vibrational characteristics. Moreover, the elastic constants (cij) and bulk moduli (B) are computed by combining the EPM with Harrison bond orbital model. The elasto-optic nature of alloys is examined by computing the photo-elastic constants. These values are significant with regard to the opto-electronic applications especially when no experimental data are available on this system.

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