Multipath trapping dynamics of nanoparticles towards an integrated waveguide with a high index contrast
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Kimerling_Multipath trapping.pdf
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Author(s)
Li, Guifang
Zhang, Lin
Tian, Hao
Kimerling, Lionel C
Michel, Jurgen
Date Issued
February 2017
Journal
Proceedings of SPIE--the Society of Photo-Optical Instrumentation Engineers
Publisher
SPIE
Citation
Tian, Hao et al. “Multipath Trapping Dynamics of Nanoparticles Towards an Integrated Waveguide with a High Index Contrast.” Proceedings of SPIE, Microfluidics, BioMEMS, and Medical Microsystems XV, Janaury 28 - February 2 2017, San Francisco, California, USA, edited by Bonnie L. Gray and Holger Becker, SPIE, February 2017 © 2017 SPIE
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1117/12.2251590
