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Interaction of metallic nanoparticles with dielectric substrates: effect of optical constants

Interaction of metallic nanoparticles with dielectric substrates: effect of optical constants
Interaction of metallic nanoparticles with dielectric substrates: effect of optical constants
In this paper, we study the local-field enhancement in a system of a metallic nanoparticle placed very near to a dielectric substrate. In such systems, intense electric fields are localized in the gap between the particle and the substrate, creating a 'hot-spot' under appropriate excitation conditions. We use finite-element numerical simulations in order to study the field enhancement in this dielectric–metal system. More specifically, we show how the optical properties of the dielectric substrate (n and k) affect the plasmonic field enhancement in the nano-gap. We also analyze the degree of field confinement in the gap and discuss it in the context of utilization for surface-enhanced Raman scattering. We finally show the fields generated by real substrates and compare them to metallic ones.
0957-4484
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Elliott, Stephen R.
e4a646fb-2898-422a-994d-5c6e166cb4b6
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Elliott, Stephen R.
e4a646fb-2898-422a-994d-5c6e166cb4b6
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9

Hutter, Tanya, Elliott, Stephen R. and Mahajan, Sumeet (2013) Interaction of metallic nanoparticles with dielectric substrates: effect of optical constants. Nanotechnology, 24 (3), [035201]. (doi:10.1088/0957-4484/24/3/035201).

Record type: Article

Abstract

In this paper, we study the local-field enhancement in a system of a metallic nanoparticle placed very near to a dielectric substrate. In such systems, intense electric fields are localized in the gap between the particle and the substrate, creating a 'hot-spot' under appropriate excitation conditions. We use finite-element numerical simulations in order to study the field enhancement in this dielectric–metal system. More specifically, we show how the optical properties of the dielectric substrate (n and k) affect the plasmonic field enhancement in the nano-gap. We also analyze the degree of field confinement in the gap and discuss it in the context of utilization for surface-enhanced Raman scattering. We finally show the fields generated by real substrates and compare them to metallic ones.

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More information

Accepted/In Press date: 14 November 2012
e-pub ahead of print date: 21 December 2012
Published date: 25 January 2013

Identifiers

Local EPrints ID: 346815
URI: http://eprints.soton.ac.uk/id/eprint/346815
ISSN: 0957-4484
PURE UUID: d480b2a2-072a-4d7f-9f12-5fce67c0c39b
ORCID for Sumeet Mahajan: ORCID iD orcid.org/0000-0001-8923-6666

Catalogue record

Date deposited: 15 Jan 2013 15:12
Last modified: 09 Nov 2021 03:16

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Contributors

Author: Tanya Hutter
Author: Stephen R. Elliott
Author: Sumeet Mahajan ORCID iD

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