DETERMINATION OF THE OPTICAL-CONSTANTS N, K OF ZN3IN2S6 AND ZN5IN2S8 FROM TRANSMISSION MEASUREMENTS

Thin layers of Zn//3In//2S//6 and Zn//5In//2S//8 laminated compounds are used to obtain interference modulated transmission spectra at normal incidence with unpolarized light. An analysis based on the use of the extremes of the fringes in the transparent region is applied in order to determine the real and imaginary parts of the refractive index, as well as the thickness of the specimens. The equation 2nd equals m lambda , helps to estimate n in the region of strong absorption so that the optical constants are finally determined in the spectral region 450 to 700 nm. Ellipsometric measurements are used to crosscheck the results at lambda equals 632. 8 nm.