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Forces on a Rayleigh particle in the cover region of a planar waveguide

Forces on a Rayleigh particle in the cover region of a planar waveguide
Forces on a Rayleigh particle in the cover region of a planar waveguide
We report on the optimization of a waveguide structure for the maximization of the radiation forces exerted on a Rayleigh particle in the cover region. The two main radiation forces involved are the transverse gradient force which attracts a particle into the waveguide and the combined scattering and dissipative forces which drive the particle forward along the channel. The dependence of these forces on parameters including the incident wavelength, the surrounding medium embedding the particles, and the polarizability of the particles is discussed. Both dielectric and metallic gold spheres of radius 10 nm are considered in the model. Special emphasis is devoted to the maximization of the transverse gradient force due to the optical intensity gradient at the waveguide surface, and the wavelength dependence of the polarizability of gold nanoparticles.
chemical sensor, optical forces, optical planar, waveguide, optical trapping, rayleigh particles
0733-8724
388-400
Ng, L.N.
00db8c9f-a390-488e-89a1-9c62f260878c
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Luff, B.J.
04d280ab-ae84-4715-9dad-6a1120050ccd
Ng, L.N.
00db8c9f-a390-488e-89a1-9c62f260878c
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Luff, B.J.
04d280ab-ae84-4715-9dad-6a1120050ccd

Ng, L.N., Wilkinson, J.S., Zervas, M.N. and Luff, B.J. (2000) Forces on a Rayleigh particle in the cover region of a planar waveguide. Journal of Lightwave Technology, 18 (3), 388-400. (doi:10.1109/50.827512).

Record type: Article

Abstract

We report on the optimization of a waveguide structure for the maximization of the radiation forces exerted on a Rayleigh particle in the cover region. The two main radiation forces involved are the transverse gradient force which attracts a particle into the waveguide and the combined scattering and dissipative forces which drive the particle forward along the channel. The dependence of these forces on parameters including the incident wavelength, the surrounding medium embedding the particles, and the polarizability of the particles is discussed. Both dielectric and metallic gold spheres of radius 10 nm are considered in the model. Special emphasis is devoted to the maximization of the transverse gradient force due to the optical intensity gradient at the waveguide surface, and the wavelength dependence of the polarizability of gold nanoparticles.

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More information

Published date: March 2000
Keywords: chemical sensor, optical forces, optical planar, waveguide, optical trapping, rayleigh particles

Identifiers

Local EPrints ID: 65776
URI: http://eprints.soton.ac.uk/id/eprint/65776
ISSN: 0733-8724
PURE UUID: bc592eb2-6405-43ca-9da3-06b809dc607c
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 23 Mar 2009
Last modified: 18 Feb 2021 16:39

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