Laser trapping and assembling of nanoparticles at solution surface studied by reflection micro-spectroscopy

Shun Fa Wang, Ken Ichi Yuyama*, Teruki Suigiyama, Hiroshi Masuhara

*Corresponding author for this work

研究成果: Conference contribution同行評審

1 引文 斯高帕斯(Scopus)

摘要

We present the laser power dependent behavior of optical trapping assembling of 208-nm polystyrene (PS) nanoparticles at the solution surface layer. The assembling dynamics is examined by reflection microspectroscopy as well as transmission and backscattering imaging. The transmission imaging shows that the laser irradiation at the solution surface layer forms a nanoparticle assembly, whose diameter becomes large with the increase in the laser power. The backscattering image of the assembly gives structural color, meaning that nanoparticles are periodically arranged over the whole assembly region. In reflection microspectroscopy, one band appears at long wavelength and is gradually shifted to the short wavelength with the irradiation. After the blue shift, the reflection band is located at the shorter wavelength under the laser irradiation at the higher power. We discuss these spectral changes from the viewpoint of the inter-particle distance determined by the dynamic balance between attractive optical force and repulsive electrostatic force among nanoparticles.

原文English
主出版物標題Optical Trapping and Optical Micromanipulation XII
編輯Gabriel C. Spalding, Kishan Dholakia, Kishan Dholakia, Gabriel C. Spalding
發行者SPIE
ISBN(電子)9781628417142, 9781628417142
DOIs
出版狀態Published - 八月 2015
事件Optical Trapping and Optical Micromanipulation XII - San Diego, United States
持續時間: 9 八月 201512 八月 2015

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
9548
ISSN(列印)0277-786X
ISSN(電子)1996-756X

Conference

ConferenceOptical Trapping and Optical Micromanipulation XII
國家United States
城市San Diego
期間9/08/1512/08/15

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