Depolarization of evanescent waves scattered by laser-trapped gold particles: effect of particle size

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Title: Depolarization of evanescent waves scattered by laser-trapped gold particles: effect of particle size
Author(s): Gu, Min; Ke, Puchun
Abstract: Depolarization of evanescent waves scattered by laser-trapped gold particles of 0.1, 0.5 and 2 µm in diameter is experimentally characterized in order to reveal its dependence on the size of particles. It is found that the degree of polarization of scattered evanescent waves decreases with the size of gold particles, which is contrary to that previously observed for dielectric particles. This feature becomes advantageous in particle-trapped near-field microscopy since less depolarized photons carry more information of a sample. With the help of polarization gating, this property is demonstrated in images of the evanescent wave interference pattern as well as the surface of a glass prism.
Publication type: Journal article
Research centre: Swinburne University of Technology. School of Biophysical Sciences and Electrical Engineering. Centre for Micro-Photonics
Source: Journal of applied physics, Vol. 88, no. 9 (Nov. 2000), pp. 5415-5420
Publication year: 2000
Keyword(s): Gold; Light scattering; Light polarisation; Radiation pressure; Particle size; Light interference; Near-field scanning optical microscopy; Surface plasmin resonance
Publisher: American Institute of Physics
ISSN: 0021-8979
Publisher URL: http://dx.doi.org/10.1063/1.1316052
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