Thickness dependent optical dispersion parameters and nonlinear optical properties of nanostructured Cr doped CdO thin films

Cr doped CdO thin films were deposited on glass substrates by reactive DC magnetron sputtering with varying film thickness from 250 to 400 nm. XRD studies reveal that the films exhibit cubic structure with preferred orientation along the (2 0 0) plane. The optical transmittance of the films decrease...

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Bibliographic Details
Published in:Optical and quantum electronics 2017-02, Vol.49 (2), p.1-13, Article 86
Main Authors: Hymavathi, B., Rajesh Kumar, B., Subba Rao, T.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Computer Communication Networks
Electrical Engineering
Lasers
Optical Devices
Optical properties
Optics
Photonics
Physics
Physics and Astronomy
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Summary:Cr doped CdO thin films were deposited on glass substrates by reactive DC magnetron sputtering with varying film thickness from 250 to 400 nm. XRD studies reveal that the films exhibit cubic structure with preferred orientation along the (2 0 0) plane. The optical transmittance of the films decreases from 92 to 72%, whereas the optical energy band gap of the films decreased from 2.88 to 2.78 eV with increasing film thickness. The Wemple–DiDomenico single oscillator model has been used to evaluate the optical dispersion parameters such as dispersion energy (E d ), oscillator energy (E o ), static refractive index (n o ) and high frequency dielectric constant (ε ∞ ). The nonlinear optical parameters such as optical susceptibility (χ (1) ), third order nonlinear optical susceptibility (χ (3) ) and nonlinear refractive index (n 2 ) of the films were also determined.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-017-0935-5