Sprayed nanocrystalline ZMS thin films for nonlinear optical device applications

Ganesha Krishna, V S and Patil, Parutagouda Shankaragouda and Maidur, Shivaraj R and Mahesha, M G (2019) Sprayed nanocrystalline ZMS thin films for nonlinear optical device applications. Optical Materials, 96. pp. 109304-1. ISSN 0925-3467

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Growth and characterization of novel Zn(1-x)MgxS (ZMS) thin films for the nonlinear optical applications are reported here. ZMS thin films were deposited by industrial friendly spray pyrolysis method at optimized deposition conditions. XRD showed good crystallinity having crystallite size in the range 4.6–11nm. It also confirmedthe presenceofmixed phasesofzincblende andwurtzitehaving strongorientation along (111)and (104) planes respectively. All the films have shown transmittance in the range 75%–90%. Detailed analysis of the transmittancedatarevealedaslightincreaseinthebandgapfrom3.42eVtoamaximumof3.48eVfor4at%Mg doped thin films. Photoluminescence study confirmed the presence of intermediate bands in the doped thin films. Substantial change in third order optical susceptibility (χ(3)) and nonlinear refractive index (n2) values were observed for the doped films as compared to pristine samples. Remarkably, there was a flip from saturable absorption (SA) into the reverse saturation absorption (RSA) for the doped films. Z-scan studies showed that the spray deposited ZMS thin films are suitable for the nonlinear devices such as optical limiters and modulators.

Item Type: Article
Uncontrolled Keywords: Chalcogenides; Thin films; Z-Scan; NLO; Spray pyrolysis
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 25 Oct 2019 04:40
Last Modified: 25 Oct 2019 04:40
URI: http://eprints.manipal.edu/id/eprint/154675

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