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Proceedings Paper

Femtosecond trapping efficiency enhanced for nano-sized silica spheres
Author(s): Anwar Usman; Wei-Yi Chiang; Hiroshi Masuhara
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Paper Abstract

We present a comparison of optical trapping of 50-nm-sized silica nanospheres, suspended in water medium, by femtosecond laser pulses and by continuous wave laser beam. With bright field microscopic imaging, we demonstrated that intensity of scattering light at the focal area under fs-pulse mode is much higher than that under cw mode. This result offers a basic interpretation that trapping efficiency of nanometer-sized particles by the ultrashort laser pulses is higher than that by the cw mode at the same laser power. We interpret this finding by means of impulsive peak power of the femtosecond laser pulses.

Paper Details

Date Published: 10 October 2012
PDF: 7 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 845833 (10 October 2012); doi: 10.1117/12.929462
Show Author Affiliations
Anwar Usman, National Chiao Tung Univ. (Taiwan)
Wei-Yi Chiang, National Chiao Tung Univ. (Taiwan)
Hiroshi Masuhara, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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