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Near-Field Radiation from Nano-Particles and Nano-Antennas Illuminated with a Focused Beam of Light

Published online by Cambridge University Press:  31 January 2011

Kursat Sendur ,
Ahmet Sahinoz ,
Eren Unlu ,
Serkan Yazici  and
Mert Gulhan
Kursat Sendur
Affiliation:
[email protected], Sabanci University, Istanbul, Turkey
Ahmet Sahinoz
Affiliation:
[email protected], Sabanci University, Istanbul, Turkey
Eren Unlu
Affiliation:
[email protected], Sabanci University, Istanbul, Turkey
Serkan Yazici
Affiliation:
[email protected], Sabanci University, Istanbul, Turkey
Mert Gulhan
Affiliation:
[email protected], Sabanci University, Istanbul, Turkey
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Abstract

The interaction of photons with metallic nanoparticles and nanoantennas yields large enhancement and tight localization of electromagnetic fields in the vicinity of nanoparticles. In the first part of this study, the interaction of a spherical nanoparticle with focused beams of various angular spectra is investigated. This study demonstrates that the focused light can be utilized to manipulate the near-field radiation around nanoparticles. In the second part of this study, the interaction between linearly and radially polarized focused light with prolate spheroidal nanoparticles and nano-antennas is investigated. Strong and tightly localized longitudinal components of a radially polarized focused beam can excite strong plasmon modes on elongated nanoparticles such as prolate spheroids. The effect of a focused beam on parameters such as the numerical aperture of a beam and the wavelength of incident light, as well as particle geometry and composition are also studied.

Keywords

opticalnanoscaleoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1182: Symposium EE – Materials for Nanophotonics–Plasmonics, Metamaterials and Light Localization , 2009 , 1182-EE16-03
Copyright
Copyright © Materials Research Society 2009

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