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.
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Elliott, Stephen R.
e4a646fb-2898-422a-994d-5c6e166cb4b6
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
25 January 2013
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).
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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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
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Date deposited: 15 Jan 2013 15:12
Last modified: 15 Mar 2024 03:28
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Author:
Tanya Hutter
Author:
Stephen R. Elliott
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