Materiality of antimony doping in Ge–S amorphous chalcogenides in nonlinear switching

Abstract

Optical transmissions are involved in the Ge₂₅S_75−xSb_x (x = 0, 10) chalcogenides thin films within the range of wavelength 300 to 3100 nm. Swanepoel’s approach is used for evaluation of linear optical parameters (n, k, x, εʹ and εʺ) on the basis of transmission measurements. Optical band gap (2.49 and 1.89 eV) and dispersion analysis are done by using Tauc’s and WDD relations, respectively. In search of the possibility of nonlinear switching in Ge₂₅S_75−xSb_x (x = 0, 10) chalcogenides, nonlinear index of refractions (1.456 × 10⁻¹² esu and 2.153 × 10⁻¹² esu) and nonlinear susceptibility (4.55 × 10⁻¹³ and 7.01 × 10⁻¹³) are also evaluated. Based on result out comes on the basis of figure of merit, the applicability for photonics is discussed.