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Near-field plasmonics of an individual dielectric nanoparticle above a metallic substrate

Near-field plasmonics of an individual dielectric nanoparticle above a metallic substrate
Near-field plasmonics of an individual dielectric nanoparticle above a metallic substrate
In this work, we simulate and discuss the local electric-field enhancement in a system of a dielectric nanoparticle placed very near to a metallic substrate. We use finite-element numerical simulations in order to understand the field-enhancement mechanism in this dielectric NP-on-mirror system. Under appropriate excitation conditions, the gap between the particle and the substrate becomes a ‘hot-spot’, i.e. a region of intense electromagnetic field. In this work, we also show how the optical properties of the dielectric NP placed on a metallic substrate affect the plasmonic field enhancement in the nano-gap and characterize the confinement in the gap. Our study helps to understand and design systems with dielectric NPs on metallic substrates which can be equally as effective for SERS, fluorescence and non-linear phenomena as conventional all-metal plasmonic structures.
1932-7447
7784-7790
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Huang, Fu Min
1e6fc160-8f6c-48f9-ad58-b993047b5a30
Elliot, Stephen
6ce5d1e7-6c43-4092-bb03-8825717d9f24
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Huang, Fu Min
1e6fc160-8f6c-48f9-ad58-b993047b5a30
Elliot, Stephen
6ce5d1e7-6c43-4092-bb03-8825717d9f24
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9

Hutter, Tanya, Huang, Fu Min, Elliot, Stephen and Mahajan, Sumeet (2013) Near-field plasmonics of an individual dielectric nanoparticle above a metallic substrate. The Journal of Physical Chemistry C, 117 (15), 7784-7790. (doi:10.1021/jp400963f).

Record type: Article

Abstract

In this work, we simulate and discuss the local electric-field enhancement in a system of a dielectric nanoparticle placed very near to a metallic substrate. We use finite-element numerical simulations in order to understand the field-enhancement mechanism in this dielectric NP-on-mirror system. Under appropriate excitation conditions, the gap between the particle and the substrate becomes a ‘hot-spot’, i.e. a region of intense electromagnetic field. In this work, we also show how the optical properties of the dielectric NP placed on a metallic substrate affect the plasmonic field enhancement in the nano-gap and characterize the confinement in the gap. Our study helps to understand and design systems with dielectric NPs on metallic substrates which can be equally as effective for SERS, fluorescence and non-linear phenomena as conventional all-metal plasmonic structures.

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More information

e-pub ahead of print date: 27 March 2013
Published date: 18 April 2013

Identifiers

Local EPrints ID: 350726
URI: http://eprints.soton.ac.uk/id/eprint/350726
ISSN: 1932-7447
PURE UUID: 4eb6b131-ba1f-4b5f-9215-00ee72862322
ORCID for Sumeet Mahajan: ORCID iD orcid.org/0000-0001-8923-6666

Catalogue record

Date deposited: 05 Apr 2013 17:06
Last modified: 09 Nov 2021 03:16

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Contributors

Author: Tanya Hutter
Author: Fu Min Huang
Author: Stephen Elliot
Author: Sumeet Mahajan ORCID iD

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