Size dependence of non-linear optical properties of SiO2 thin films containing InP nanocrystals |
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Authors: | MJ Zheng LD Zhang JG Zhang |
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Institution: | (1) Institute of Solid State Physics, Chinese Academy of Sciences, P.O. Box 1129, Hefei 230031, P.R. China (Fax: +86-551/5591-434, E-mail: nanolab@mail.issp.ac.cn), CN |
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Abstract: | SiO2 composite thin films containing InP nanocrystals were fabricated by radio-frequency magnetron co-sputtering technique. The
microstructure of the composite thin films was characterized by X-ray diffraction and Raman spectrum. The optical absorption
band edges exhibit marked blueshift with respect to bulk InP due to strong quantum confinement effect. Non-linear optical
absorption and non-linear optical refraction were studied by a Z-scan technique using a single Gaussian beam of a He-Ne laser
(632.8 nm). We observed the saturation absorption and two-photon absorption in the composite films. An enhanced third-order
non-linear optical absorption coefficient and non-linear optical refractive index were achieved in the composite films. The
nonlinear optical properties of the films display the dependence on InP nanocrystals size.
Received: 27 June 2000 / Accepted: 27 June 2000 / Published online: 13 September 2000 |
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Keywords: | PACS: 78 66 -W 81 15 Cd 42 65 -K 61 46 +W 71 35 Cc |
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