Sahoo, D and Priyadarshini, P and Dandela, R and Alagarasan, D and Ganesan, R and Varadharajaperumal, S and Naik, R (2021) In situ laser irradiation: The kinetics of the changes in the nonlinear/linear optical parameters of As50Se40Sb10thin films for photonic applications. In: RSC Advances, 11 (26). pp. 16015-16025.
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Abstract
The photosensitivity of amorphous chalcogenide thin films brings out light-induced changes in the nonlinear and linear optical parameters upon sub-bandgap and bandgap laser irradiation. The present work reports the in situ laser irradiated changes in the optical properties of As50Se40Sb10 thin films. The thermally evaporated film showed an exponential decrease in optical bandgap and increase in Urbach energy. The decay rate of the bandgap was 6.24 min and growth rate of Urbach energy was 6.67 min respectively. The dynamics of photo-induced changes were observed from the changes in linear refractive index and its dependent parameters such as 3rd order nonlinear susceptibility, nonlinear refractive index, dispersion and dielectric parameters. The conversion of heteropolar to homopolar bonds induced the photodarkening mechanism that changed the dispersion parameters. The decrease in Ed and Eo reduced the oscillator strength along with the zero-frequency dielectric constant. The optical and electrical conductivity changed significantly with time. The changes were saturated with time which brings stability in the film properties that is useful for various optical applications. However, no structural and compositional changes upon laser irradiation were noticed from the X-ray diffraction and EDX studies respectively. The surface homogeneity was checked from the FESEM picture.
| Item Type: | Journal Article |
|---|---|
| Publication: | RSC Advances |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Antimony compounds; Arsenic compounds; Decay (organic); Dispersion (waves); Energy gap; Growth rate; Irradiation; Nonlinear optics; Optical variables control; Refractive index; Selenium compounds; Thin films, Amorphous chalcogenide; Compositional changes; Dielectric parameters; Dispersion parameters; Electrical conductivity; Light-induced changes; Nonlinear refractive index; Nonlinear susceptibilities, Optical films |
| Department/Centre: | Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 09 May 2023 08:41 |
| Last Modified: | 09 May 2023 08:41 |
| URI: | https://eprints.iisc.ac.in/id/eprint/81477 |
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