Size-dependent nonlinear absorption and refraction of Ag nanoparticles excited by femtosecond lasers

Silver （Ag） nanoparticles with different average sizes are prepared, and the nonlinear absorption and refraction of these nanoparticles are investigated with femtosecond laser pulses at 800 nm. The smallest Ag nanoparticles show insignificant nonlinear absorption, whereas the larger ones show satura...

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Bibliographic Details
Published in	Chinese physics B Vol. 21; no. 4; pp. 560 - 568
Main Author	范光华曲士良郭忠义王强李中国
Format	Journal Article
Language	English
Published	01.04.2012
Subjects	Ag纳米粒子 Conduction band Electronics Energy bands Femtosecond Lasers Nanoparticles Nonlinearity Refraction Silver 激光激发电子跃迁纳米颗粒银纳米粒子非线性吸收非线性折射飞秒激光脉冲
Online Access	Get full text
ISSN	1674-1056 2058-3834 1741-4199
DOI	10.1088/1674-1056/21/4/047804

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Summary:	Silver （Ag） nanoparticles with different average sizes are prepared, and the nonlinear absorption and refraction of these nanoparticles are investigated with femtosecond laser pulses at 800 nm. The smallest Ag nanoparticles show insignificant nonlinear absorption, whereas the larger ones show saturable absorption. By considering the previously reported positive nonlinear absorption of 9 nm Ag nanopartieles, the nonlinear absorptions of Ag nanopartieles are found to be size-dependeut. All these nonlinear absorptions can be compatibly explained from the viewpoints of electronic transitions, energy bands and electronic structures in the conduction band of Ag nanoparticles. The nonlinear refraction is attributed to the effect of hot electrons arising from the intraband transition in the s p conduction band of Ag nanoparticles.
Bibliography:	nonlinear absorption, nonlinear refraction, silver nanoparticles, electronic structures Fan Guang-Hua, Qu Shi-Liang, Guo Zhong-Yi, Wang Qiang, and Li Zhong-Guo a） Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209 b） Department of Physics, Harbin Institute of Technology, Harbin 150001, China c） School of Physical Science and Technology, Suzhou University, Suzhou 215006, China Silver （Ag） nanoparticles with different average sizes are prepared, and the nonlinear absorption and refraction of these nanoparticles are investigated with femtosecond laser pulses at 800 nm. The smallest Ag nanoparticles show insignificant nonlinear absorption, whereas the larger ones show saturable absorption. By considering the previously reported positive nonlinear absorption of 9 nm Ag nanopartieles, the nonlinear absorptions of Ag nanopartieles are found to be size-dependeut. All these nonlinear absorptions can be compatibly explained from the viewpoints of electronic transitions, energy bands and electronic structures in the conduction band of Ag nanoparticles. The nonlinear refraction is attributed to the effect of hot electrons arising from the intraband transition in the s p conduction band of Ag nanoparticles. 11-5639/O4 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1674-1056 2058-3834 1741-4199
DOI:	10.1088/1674-1056/21/4/047804