Special Section on Nanostructures Honoring Craig F. Bohren

Optical binding of electrically small magnetodielectric particles

[+] Author Affiliations
Kesava Jay

University of Technology Sydney, Department of Mathematical Sciences, Broadway, New South Wales 2007 Australia

Patrick C. Chaumet

Institut Fresnel (UMR 6133), Faculte´ de Saint Je´roˆme, Service 161 Av. Escadrille Normandie-Niemen, Marseille, France 13397 France

T. N. Langtry, Adel Rahmani

University of Technology Sydney, Department of Mathematical Sciences, Broadway, New South Wales 2007 Australia

J. Nanophoton. 4(1), 041583 (February 17, 2010). doi:10.1117/1.3356225
History: Received October 14, 2009; Revised January 22, 2010; Accepted January 22, 2010; February 17, 2010; Online February 17, 2010
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Abstract

An ensemble of spherical particles with arbitrary dielectric permittivity and magnetic permeability was considered in the dipole approximation. Each particle was described by complex electric and magnetic polarizabilities. A computational approach based on the coupled dipole method, also called the discrete dipole approximation, was used to derive the optical force experienced by each particle due to an incident electromagnetic field and the fields scattered by all other particles. This approach is general and can handle material dispersion and losses. In order to illustrate this approach, we studied the case of two spherical particles separated by a distance d, and illuminated by an incident plane wave whose wave vector is normal to the axis of the particles. We computed the optical force experienced by each particle in the direction of the beam (radiation pressure), and perpendicular to the beam (optical binding) for particles with positive and negative refractive indices. We also considered the effect of material losses.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Kesava Jay ; Patrick C. Chaumet ; T. N. Langtry and Adel Rahmani
"Optical binding of electrically small magnetodielectric particles", J. Nanophoton. 4(1), 041583 (February 17, 2010). ; http://dx.doi.org/10.1117/1.3356225


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