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Proceedings Paper

Hyper-Rayleigh and hyper-Raman scattering from silver nanoparticles trapped by a near-infrared laser beam
Author(s): Hiroyuki Yoshikawa; Takashi Ihama; Tamitake Ito; Yukihiro Ozaki; Hiroshi Masuhara
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Paper Abstract

When near-infrared laser was focused in colloidal silver, not only optical trapping of silver nanoparticles, but also hyper-Rayleigh scattering were observed at the laser focus. By addition of NaCl and rhodamine 6G in the colloidal silver, hyper-Rayleigh scattering was enhanced and hyper-Raman scattering was also observed. These nonlinear optical responses showed temporal fluctuation in spite of the continuous laser irradiation. Experimental results suggested that aggregates which have a high activity for nonlinear optical responses were trapped and/or produced by a focusing near-infrared laser. Hyper-Raman signal, whose scattering cross section is much lower than normal Raman scattering, could be obtained easily by focusing a cw-YAG laser in colloidal silver including analytes. It was demonstrated that optical trapping of colloidal silver is a powerful technique to obtain the nonlinear optical responses.

Paper Details

Date Published: 26 August 2005
PDF: 8 pages
Proc. SPIE 5930, Optical Trapping and Optical Micromanipulation II, 59300T (26 August 2005); doi: 10.1117/12.614706
Show Author Affiliations
Hiroyuki Yoshikawa, Osaka Univ. (Japan)
Takashi Ihama, Osaka Univ. (Japan)
Tamitake Ito, National Institute for Advanced Industrial Science and Technology (Japan)
Yukihiro Ozaki, Kwansei Gakuin Univ. (Japan)
Hiroshi Masuhara, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 5930:
Optical Trapping and Optical Micromanipulation II
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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