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Proceedings Paper

Trapping of nanoparticles in water by evanescent wave near a NSOM probe
Author(s): Binghui Liu; Lijun Yang; Yang Wang
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Paper Abstract

Applying Maxwell stress tensor and 3D FDTD methods, physical properties of nanoparticle trapping by evanescent wave near the NSOM probe, including trapping size, trapping position and role of other forces versus optical trapping force, are revealed. From the distribution of trapping force acted on a nanoparticle along three axis directions, it is found that the nanoparticle tends to be trapped to the aperture edge and center surface of the probe tip. In experiments 120 nm polystyrene particles are trapped in a multi-circular shape and two circles of polystyrene particles are arranged to different positions on the substrate. The results indicate that the NSOM probe is able to trap nanoparticles with lower laser intensity than that required by conventional optical manipulator.

Paper Details

Date Published: 9 September 2011
PDF: 8 pages
Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 80971Y (9 September 2011); doi: 10.1117/12.891047
Show Author Affiliations
Binghui Liu, Harbin Institute of Technology (China)
Lijun Yang, Harbin Institute of Technology (China)
Yang Wang, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 8097:
Optical Trapping and Optical Micromanipulation VIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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