標題: Femtosecond Pulse-Width Dependent Trapping and Directional Ejection Dynamics of Dielectric Nanoparticles
作者: Chiang, Wei-Yi
Usman, Anwar
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
公開日期: 19-九月-2013
摘要: We demonstrate that laser pulse duration, which determines its impulsive peak power, is an effective parameter to control the number of optically trapped dielectric nanoparticles, their ejections along the directions perpendicular to polarization vector, and their migration distances from the trapping site. This ability to controllably confine and eject the nanoparticle is explained by pulse width-dependent optical forces exerted on nanoparticles in the trapping site and ratio between the repulsive and attractive forces. We also show that the directional ejections occur only when the number of nanoparticles confined in the trapping site exceeds a definite threshold. We interpret our data by considering the formation of transient assembly of the optically confined nanoparticles, partial ejection of the assembly, and subsequent filling of the trapping site. The understanding of optical trapping and directional ejections by ultrashort laser pulses paves the way to optically controlled manipulation and sorting of nanoparticles.
URI: http://dx.doi.org/10.1021/jp404372a
http://hdl.handle.net/11536/23542
ISSN: 1932-7447
DOI: 10.1021/jp404372a
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 117
Issue: 37
起始頁: 19182
結束頁: 19188
顯示於類別:期刊論文


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  1. 000330162600048.pdf