Wide-field light scattering imaging of laser trapping dynamics of single gold nanoparticles in solution

Takayuki Uwad*, Teruki Sugiyam, Atsushi Miura, Hiroshi Masuhara

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

We present direct observation of particle transfer and assembling upon laser irradiation under a microscope. We employed gold nanoparticles (60 nm) dispersed in water as optical markers and studied laser trapping and accompanying phenomenon by wide-field Rayleigh scattering microscopy. At the focal spot of the near IR laser, laser trapping of gold was observed. Simultaneously, we observed that the particle migration toward the focal spot from all the directions within several tens micrometer. We consider that thermocapillary effect due to laser heating can assist the particle migration from far away, resulting in concentration increase not only at the focal point but also near the surrounding area.

Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation VII
DOIs
StatePublished - 27 Oct 2010
EventOptical Trapping and Optical Micromanipulation VII - San Diego, CA, United States
Duration: 1 Aug 20105 Aug 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7762
ISSN (Print)0277-786X

Conference

ConferenceOptical Trapping and Optical Micromanipulation VII
CountryUnited States
CitySan Diego, CA
Period1/08/105/08/10

Keywords

  • Gold nanoparticles
  • Laser heating
  • Laser trapping
  • Light scattering
  • Wide-field illumination

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