Hyper-Rayleigh and hyper-Raman scattering from silver nanoparticles trapped by a near-infrared laser beam

Hiroyuki Yoshikawa*, Takashi Ihama, Tamitake Ito, Yukihiro Ozaki, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

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.

Original languageEnglish
Article number59300T
Pages (from-to)1-8
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5930
DOIs
StatePublished - 1 Dec 2005
EventOptical Trapping and Optical Micromanipulation II - San Diego, CA, United States
Duration: 31 Jul 20054 Aug 2005

Keywords

  • Colloidal silver
  • Hyper-Raman scattering
  • Hyper-Rayleigh scattering
  • Optical trapping
  • Rhodamine 6G
  • Surface plasmon resonance

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