Linear and nonlinear optical studies of indium selenide thin films prepared by thermal evaporation technique

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...

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Bibliographic Details
Published in:Optik (Stuttgart) 2021-09, Vol.241, p.166874, Article 166874
Main Authors: Salwa, A.S., Salem, A., Shaban, H.T.
Format: Article
Language:English
Subjects:
Absorption coefficient
Direct energy gap
Linear optical susceptibility
Nonlinear refractive index
Optical properties of InSe
Thermal evaporated thin films
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Summary: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 χ 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.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2021.166874