Title

Heterogeneous plasmonic trimers for enhanced nonlinear optical absorption

Authors

Authors

S. Toroghi; C. Lumdee;P. G. Kik

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

NANOPARTICLES; EXCITATION; DYNAMICS; METALS; Physics, Applied

Abstract

A dramatic enhancement of the thermally induced nonlinear optical response in compositionally heterogeneous plasmonic trimers is reported. It is demonstrated numerically that the nonlinear absorption performance of silver nanoparticle dimers under pulsed illumination can be enhanced by more than two orders of magnitude through the addition of only 0.1 vol. % of gold in the dimer gap. The nonlinear absorption performance of the resulting Ag-Au-Ag trimer exceeds the peak performance of isolated gold nanoparticles by a factor 40. This dramatic effect is enabled by cascaded plasmon resonance, resulting in extreme field concentration in the central nanoparticle of the trimer. The observed localized heat-generation, large optical response, and a predicted response time below 1 ns make these structures promising candidates for use in nonlinear optical limiting and optical switching. (C) 2015 AIP Publishing LLC.

Journal Title

Applied Physics Letters

Volume

106

Issue/Number

10

Publication Date

1-1-2015

Document Type

Article

Language

English

First Page

4

WOS Identifier

WOS:000351397600048

ISSN

0003-6951

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