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Intensity-Dependent Optical Nonlinear Absorption and Refraction of Gold Nanorods |
| GONG Hong-Mei1;ZHOU Zhang-Kai1;XIAO Si1;SONG Hao1;SU Xiong-Rui1;LI Min1;WANG Qu-Quan 1,2 |
| 1Department of Physics, Wuhan University, Wuhan 4300722Key Laboratory of Acoustic and Optic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072 |
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| Cite this article: |
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GONG Hong-Mei, ZHOU Zhang-Kai, XIAO Si et al 2007 Chin. Phys. Lett. 24 3443-3446 |
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Abstract Au nanorods dispersed in aqueous solution were prepared with the electrochemical method. The absorption spectrum shows two absorption
peaks corresponding to the perpendicular and transverse surface plasma
resonance absorption of the nanorods. The third-order optical nonlinear
properties are investigated by Z-scans. The signs of the nonlinear absorption coefficient and refractive index are reversed as the intensity of incident laser increases, which is due to the shape change of the gold nanoparticles melted by the intense laser pulses.
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| Keywords:
42.70.Mp
42.65.K
82.45.Yz
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Received: 01 July 2007
Published: 03 December 2007
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