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Preparation and Nonlinear Optical Properties of Au Colloid |
| ZHAO Chong-Jun1;QU Shi-Liang1;GAO Ya-Chen2;SONG Ying-Lin2;QIU Jian-Rong1;ZHU Cong-Shan1 |
| 1Photon Craft Project, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology Corporation, Shanghai 201800
2Department of Physics, Harbin Institute of Technology, Harbin 150001 |
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| Cite this article: |
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ZHAO Chong-Jun, QU Shi-Liang, GAO Ya-Chen et al 2003 Chin. Phys. Lett. 20 1752-1754 |
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Abstract Colloidal Au less than 20 nm was prepared in an aqueous solution of HAuCl4 by irradiation with a near-infrared femtosecond laser. The absorption peak around 526 nm in the absorption spectra and the peaks 2θ = 38.3°and 2θ = 24°in the x-ray diffraction (XRD) pattern indicated the formation of Au colloid. Nonlinear optical properties of Au colloid were investigated by using the Z-scan technique with 8 ns pulses at 532 nm. The transition characteristics from self-defocusing to self-focusing and from saturable absorption (SA) to reverse saturable absorption (RSA) were observed for the Au colloid.
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| Keywords:
42.65.Jx
82.50.Pt
82.70.Dd
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Published: 01 October 2003
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| PACS: |
42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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82.50.Pt
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(Multiphoton processes)
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82.70.Dd
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(Colloids)
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