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Proceedings Paper

Plasmon resonances on opto-capacitive nanostructures
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Paper Abstract

Silver is considered as one of the most desirable materials for plasmonic devices due to it having low loss, low epsilon2, across the visible spectrum. In addition, silver nanotriangles can self-assemble into complex structures that can include tip-totip or base-to-base arrangements. While the optical properties of tip-to-tip dimers of nanotriangles have been quite intensively studied, the geometric inverse, the base-to-base configuration, has received much less attention. Here we report the results of a computational study of the optical response of this latter configuration. Calculations were performed using the discrete dipole approximation. The effect of gap size and substrate are considered. The results indicate that the base-to-base configuration can sustain a strong coupled dipole and various multimode resonances. The pairing of the parallel triangle edges produces a strongly capacitive configuration and very intense electric fields over an extended volume of space. Therefore, the base-to-base configuration could be suitable for a range of plasmonic applications that require a strong and uniform concentration of electric field. Examples include refractometeric sensing or metal-enhanced fluorescence.

Paper Details

Date Published: 22 December 2015
PDF: 11 pages
Proc. SPIE 9668, Micro+Nano Materials, Devices, and Systems, 96685C (22 December 2015); doi: 10.1117/12.2202282
Show Author Affiliations
N. Shahcheraghi, Univ. of Technology, Sydney (Australia)
A. Dowd, Univ. of Technology, Sydney (Australia)
M. D. Arnold, Univ. of Technology, Sydney (Australia)
M. B. Cortie, Univ. of Technology, Sydney (Australia)

Published in SPIE Proceedings Vol. 9668:
Micro+Nano Materials, Devices, and Systems
Benjamin J. Eggleton; Stefano Palomba, Editor(s)

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