Frequency- and polarization-dependent optical response of asymmetric spheroidal silver nanoparticles on dielectric substrate

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/147870

Title: Frequency- and polarization-dependent optical response of asymmetric spheroidal silver nanoparticles on dielectric substrate
Author(s): Mizeikis, Vygantas; Kowalska, Ewa; Ohtani, Bunsho; Juodkazis, Saulius
Abstract: We report theoretical simulations of plasmonic near-field enhancement and polarization in a system consisting of an asymmetric spheroidal Ag nanoparticle on a smooth dielectric surface. Finite-difference time-domain (FDTD) simulations reveal resonant optical extinction bands whose near-field is concentrated at the metal–substrate contact point with intensity enhancement by a factor of 103 and predominant polarization along the normal to the surface. These features may help explain enhanced photo-catalytic activity observed for colloidal Au and Ag nanoparticles on titania substrates.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics
Source: Physica Status Solidi: Rapid Research Letters, Vol. 4, no. 10 (Oct 2010), pp. 268-270
Publication year: 2010
FOR Code(s): 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering
Keyword(s): Nanoparticles; Photo-catalysis; Plasmonics; Polarization effects; Silver
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA
ISSN: 1862-6254
Publisher URL: http://dx.doi.org/10.1002/pssr.201004215
Peer reviewed