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Frequency‐ and polarization‐dependent optical response of asymmetric spheroidal silver nanoparticles on dielectric substrate
Author(s) -
Mizeikis Vygantas,
Kowalska Ewa,
Ohtani Bunsho,
Juodkazis Saulius
Publication year - 2010
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201004215
Subject(s) - finite difference time domain method , dielectric , polarization (electrochemistry) , nanoparticle , materials science , silver nanoparticle , plasmon , surface plasmon , optics , plasmonic nanoparticles , substrate (aquarium) , optoelectronics , nanotechnology , chemistry , physics , oceanography , geology
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 10 3 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.Electron microscopy image of Ag‐nanoparticles on titania and the used model for numerical FDTD simulations. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)