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

Shun-Fa Wang; Ken-ichi Yuyama; Teruki Suigiyama; Hiroshi Masuhara

doi:10.1117/12.2187636

25 August 2015 Laser trapping and assembling of nanoparticles at solution surface studied by reflection micro-spectroscopy

Shun-Fa Wang, Ken-ichi Yuyama, Teruki Suigiyama, Hiroshi Masuhara

Author Affiliations +

Proceedings Volume 9548, Optical Trapping and Optical Micromanipulation XII; 954821 (2015) https://doi.org/10.1117/12.2187636
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

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.

Citation Download Citation

Shun-Fa Wang, Ken-ichi Yuyama, Teruki Suigiyama, and Hiroshi Masuhara "Laser trapping and assembling of nanoparticles at solution surface studied by reflection micro-spectroscopy", Proc. SPIE 9548, Optical Trapping and Optical Micromanipulation XII, 954821 (25 August 2015); https://doi.org/10.1117/12.2187636

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available