Optical trapping of dielectric nanoparticles in resonant cavities
Name
Hu-2010-Optical trapping of.pdf
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Author(s)
Hu, Juejun
Lin, Shiyun
Kimerling, Lionel C.
Crozier, Kenneth
Date Issued
August 2009
Journal
Physical Review A
Publisher
American Physical Society
Citation
Hu, Juejun et al. “Optical Trapping of Dielectric Nanoparticles in Resonant Cavities.” Physical Review A 82.5 (2010) : 053819. © 2010 The American Physical Society
Version
Final published version
Abstract
We theoretically investigate the opto-mechanical interactions between a dielectric nanoparticle and the resonantly enhanced optical field inside a high Q, small-mode-volume optical cavity. We develop an analytical method based on open system analysis to account for the resonant perturbation due to particle introduction and predict trapping potential in good agreement with three-dimensional (3D) finite-difference time-domain (FDTD) numerical simulations. Strong size-dependent trapping dynamics distinctly different from free-space optical tweezers arise as a consequence of the finite cavity perturbation. We illustrate single nanoparticle trapping from an ensemble of monodispersed particles based on size-dependent trapping dynamics. We further discover that the failure of the conventional dipole approximation in the case of resonant cavity trapping originates from a new perturbation interaction mechanism between trapped particles and spatially localized photons.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Microphotonics Center
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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/10.1103/PhysRevA.82.053819
