Title

Cascaded plasmon resonant field enhancement in nanoparticle dimers in the point dipole limit

Authors

Authors

S. Toroghi;P. G. Kik

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

Physics, Applied

Abstract

Cascaded field enhancement in silver dimer nanostructures is investigated using a dipole-dipole interaction model. Field enhancement spectra are evaluated as a function of the particle size difference and inter-particle spacing. We observe three distinct regimes of cascaded field enhancement: hindered cascading, multiplicative cascading, and the ultimate cascading limit, depending on the dimer interaction strength. Multiplicative cascading at small inter-particle spacing leads to analytic expressions for the ultimate internal and external field enhancement factors. For silver dimers in a host with index 1.5, we obtain a maximum internal field enhancement of 2.9 X 10(3), a factor of 75 larger than that of an isolated silver nanoparticle. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4707159]

Journal Title

Applied Physics Letters

Volume

100

Issue/Number

18

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

4

WOS Identifier

WOS:000303598600046

ISSN

0003-6951

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