Journal
OPTIK
Volume 241, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2021.166874
Keywords
Optical properties of InSe; Thermal evaporated thin films; Nonlinear refractive index; Linear optical susceptibility; Absorption coefficient; Direct energy gap
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The manuscript discusses the linear and nonlinear optical studies of thin indium selenide films prepared using the thermal evaporation technique, which is of interest due to its specific characteristics. The optical band gaps for direct and indirect transitions were found to decrease as the film thickness increased.
The manuscript concerns linear and nonlinear optical studies of thin indium selenide films are prepared using thermal evaporation technique, which is intensively researched due to its specific characteristics. In the wavelength range, 300-2500 nm, the transmission and reflection spectrum were taken using the VIS-NIR spectrophotometer. For processed films, the nonlinear optical parameters viz. nonlinear refractive index (n2) and third order nonlinear susceptibilities chi 3have been tested by numerical calculation. The optical band gaps obtained from Tauc's relationship for direct and indirect transitions are within the scope of 3.6 -1.9 eV and 1.55-1.1 eV, respectively, and the band gap expanded with film thickness decreases.
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