NDLI: Optical Forces on Non-Spherical Nanoparticles Trapped by Optical Waveguides

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Optical Forces on Non-Spherical Nanoparticles Trapped by Optical Waveguides

Content Provider	Taylor & Francis Online
Author	Sung, Hyung Jin Ahmed, Dewan Hasan
Abstract	Numerical simulations of a solid-core polymer waveguide structure were performed to calculate the trapping efficiencies of particles with nanoscale dimensions smaller than the wavelength of the trapping beam. A three-dimensional (3-D) finite element method was employed to calculate the electromagnetic field. The inlet and outlet boundary conditions were obtained using an eigenvalue solver to determine the guided and evanescent mode profiles. The Maxwell stress tensor was considered for the calculation of the transverse and downward trapping efficiencies. A particle at the center of the waveguide showed minimal transverse trapping efficiency and maximal downward trapping efficiency. This trend gradually reversed as the particle moved away from the center of the waveguide. Particles with larger surface areas exhibited higher trapping efficiencies and tended to be trapped near the waveguide. Particles displaced from the wave input tended to be trapped at the waveguide surface. Simulation of an ellipsoidal particle showed that the orientation of the major axis along the waveguide's lateral z-coordinate significantly influenced the trapping efficiency. The particle dimensions along the z-coordinate were more critical than the gap distance (vertical displacement from the floor of the waveguide) between the ellipsoid particle and the waveguide. The present model was validated using the available results reported in the literature for different trapping efficiencies.
Starting Page	217
Ending Page	233
Page Count	17
File Format	PDF HTM / HTML
ISSN	15599612 15599620
DOI	10.1080/15599612.2011.604118
Journal	International Journal of Optomechatronics
Volume Number	5
Issue Number	3
Language	English
Publisher	Taylor & Francis Group
Publisher Date	2011-09-21
Access Restriction	Open
Subject Keyword	Downward trapping Electromagnetic field Optical trap Transverse trapping Trapping efficiency Waveguide
Content Type	Text
Resource Type	Article
Subject	Instrumentation Mechanical Engineering Electrical and Electronic Engineering

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