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Observation of three-photon absorption and saturation of two-photon absorption in amorphous nanolayered Se/As2S3 thin film structures

Sangunni, K. S and Adarsh, K. V. and Philip, Reji and Sandeep, C. S. Suchand and Takats, V. and Kokenyesi, S. (2007) Observation of three-photon absorption and saturation of two-photon absorption in amorphous nanolayered Se/As2S3 thin film structures. Journal of Applied Physics, 102, 026102 (2). 026102 . ISSN 0021-8979

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Abstract

We have studied the nonlinear optical properties of nanolayered Se/As2S3 film with a modulation period of 10 nm and a total thickness of 1.15 µm at two [1064 nm (8 ns) and 800 nm (20 ps)] wavelengths using the standard Z-scan technique. Three-photon absorption was observed at off-resonant excitation and saturation of two-photon absorption at quasiresonant excitation. The observation of the saturation of two-photon absorption is because the pulse duration is shorter than the thermalization time of the photocreated carriers in their bands and three-photon absorption is due to high excitation irradiance.

Item Type:Article
Subjects:Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4300
Deposited By:JNCASR
Deposited On:03 Apr 2009 05:27
Last Modified:08 Apr 2009 15:38

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