標題: Wide-field Rayleigh scattering imaging and spectroscopy of gold nanoparticles in heavy water under laser trapping
作者: Uwada, Takayuki
Sugiyama, Teruki
Masuhara, Hiroshi
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: Gold nanoparticle;Rayleigh scattering;Laser trapping;Nanomaterial assembling
公開日期: 25-六月-2011
摘要: We demonstrated wide-field Rayleigh scattering spectroscopy and imaging of gold nanoparticle trapping upon a focused near-infrared laser irradiation under dark-field illumination. The migration, trapping, and assembling behavior of gold nanoparticles were examined at single nanoparticle level at the focus spot and its surrounding area in heavy water. It is clarified that particle migration to the laser spot within the focal plane is not appreciable while scattering force drives the migration vertically along the direction of light propagation. The gradient force at the focus point and the scattering force are theoretically estimated to be 3.1 and 0.17 pN, which are consistent with the direct observation. Analysis of light scattering intensity fluctuation at the focus shows that three nanoparticles can be trapped at most, which is well supported by light scattering spectral measurement. The particle existence probability at the focus is estimated as a function of lateral distance from the focus, and is compared with numerically obtained photon pressure potential. (C) 2011 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jphotochem.2011.05.015
http://hdl.handle.net/11536/22430
ISSN: 1010-6030
DOI: 10.1016/j.jphotochem.2011.05.015
期刊: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume: 221
Issue: 2-3
起始頁: 187
結束頁: 193
顯示於類別:期刊論文


文件中的檔案:

  1. 000293813800012.pdf