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Proceedings Paper

Multipath trapping dynamics of nanoparticles towards an integrated waveguide with a high index contrast
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Paper Abstract

Optical trapping and manipulation of nanoparticles in integrated photonics devices have recently received increasingly more attention and greatly facilitated the advances in lab-on-chip technologies. In this work, by solving motion equation numerically, we study the trapping dynamics of a nanoparticle near a high-index-contrast slot waveguide, under the influence of water flow perpendicular to the waveguide. It is shown that a nanoparticle can go along different paths before it gets trapped, strongly depending on its initial position relative to the integrated waveguide. Due to localized optical field enhancement on waveguide sidewalls, there are multiple trapping positions, with a critical area where particle trapping and transport are unstable. As the water velocity increases, the effective trapping range shrinks, but with a rate that is smaller than the increasing of water velocity. Finally, the trapping range is shown to decrease for smaller slot width that is below 100 nm, even though smaller slot width generates stronger local optical force.

Paper Details

Date Published: 28 February 2017
PDF: 8 pages
Proc. SPIE 10061, Microfluidics, BioMEMS, and Medical Microsystems XV, 100610P (28 February 2017); doi: 10.1117/12.2251590
Show Author Affiliations
Hao Tian, Tianjin Univ. (China)
Massachusetts Institute of Technology (United States)
Lionel C. Kimerling, Massachusetts Institute of Technology (United States)
Jurgen Michel, Massachusetts Institute of Technology (United States)
Guifang Li, Tianjin Univ. (China)
CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Lin Zhang, Tianjin Univ. (China)
Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 10061:
Microfluidics, BioMEMS, and Medical Microsystems XV
Bonnie L. Gray; Holger Becker, Editor(s)

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