Optical limiting in hydrogenated amorphous silicon-selenium thin films |
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| Authors: | Hacene Manaa Abdullah Al-Mulla Shawqi Al-Dallal |
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| Affiliation: | a Physics Department, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait
b Physics Department, University of Bahrain, P.O. Box 32038, Bahrain |
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| Abstract: | Hydrogenated amorphous silicon-selenium alloy thin films grown by capacitively coupled radio-frequency glow-discharge are investigated. Nonlinear absorptive effects are evaluated with the help of open aperture z-scan technique in the 525 to 580 nm spectral range. The nonlinear absorption coefficient is found to be very large and reaching the value of 5.14 × 10− 3 cm/W at 525 nm. The origin of the optical nonlinearities is studied and found to be due mainly to two photon absorption in the case of pulsed excitation, whereas thermal effects are thought to be dominant when the sample is excited with a continuous wave laser. Optical limiting potentialities of the thin film are experimentally observed and their thresholds are found to be very low. |
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| Keywords: | Amorphous silicon Optical limiting Z-scan Nonlinear optics Thin films Solar cells Optical materials Photonic devices |
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