Optical constants of zinc sulfide films determined from transmittance measurements

The optical constants of thermally evaporated thin films of ZnS have been determined by measurements of transmittance at normal incidence from two films of different thickness. A single-layer model has been successfully used for the films. The results are compared with those obtained earlier for thermally evaporated ZnS films using reflectance and transmittance measurements (where a two-layer model for a ZnS film was used). The advantage of the present method over the earlier one is the readily available measurement facilities.