Abstract:Thin films of Ge 30 Se 50 Te 20 with thickness of 100, 150, 200 and 250 nm were prepared by thermal evaporation technique on glass substrates. Normal-incidence optical transmission spectra have been measured in the range from 190 to 900 nm. The optical constants were calculated using Swanepoel's method. The effect of film thickness on the optical constants had been investigated. Analysis of the refractive index (n) yields the values of the high frequency dielectric constant, Wemple's single oscillator energy E… Show more
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