Omnidirectional Excitation Of Sidewall Gap-Plasmons In A Hybrid Gold-Nanoparticle/Aluminum-Nanopore Structure

Abstract

The gap-plasmon resonance of a gold nanoparticle inside a nanopore in an aluminum film is investigated in polarization dependent single particle microscopy and spectroscopy. Scattering and transmission measurements reveal that gap-plasmons of this structure can be excited and observed under normal incidence excitation and collection, in contrast to the more common particle-on-a-mirror structure. Correlation of numerical simulations with optical spectroscopy suggests that a local electric field enhancement factor in excess of 50 is achieved under normal incidence excitation, with a hot-spot located near the top surface of the structure. It is shown that the strong field enhancement from this sidewall gap-plasmon mode can be efficiently excited over a broad angular range. The presented plasmonic structure lends itself to implementation in low-cost, chemically stable, easily addressable biochemical sensor arrays providing large optical field enhancement factors.

Publication Date

6-1-2016

Publication Title

APL Photonics

Volume

1

Issue

3

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1063/1.4945354

Socpus ID

85055404109 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85055404109

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