The University of Southampton
University of Southampton Institutional Repository

Tuning localized plasmons in nanostructured substrates for surface-enhanced Raman scattering

Tuning localized plasmons in nanostructured substrates for surface-enhanced Raman scattering
Tuning localized plasmons in nanostructured substrates for surface-enhanced Raman scattering
Comprehensive reflectivity mapping of the angular dispersion of nanostructured arrays comprising of inverted pyramidal pits is demonstrated. By comparing equivalently structured dielectric and metallic arrays, diffraction and plasmonic features are readily distinguished. While the diffraction features match expected theory, localised plasmons are also observed with severely flattened energy dispersions. Using pit arrays with identical pitch, but graded pit dimensions, energy scaling of the localised plasmon is observed. These localised plasmons are found to match a simple model which confines surface plasmons onto the pit sidewalls thus allowing an intuitive picture of the plasmons to be developed. This model agrees well with a 2D finite-difference time-domain simulation which shows the same dependence on pit dimensions. We believe these tuneable plasmons are responsible for the surface-enhancement of the Raman scattering (SERS) of an attached layer of benzenethiol molecules. Such SERS substrates have a wide range of applications both in security, chemical identification, environmental monitoring and healthcare.
Surface plasmons Diffraction theory Metals, optics of Spectroscopy, Raman Gratings
1094-4087
847-857
Perney, Nicholas M.B.
c3fafd4b-a157-4ae3-bb19-eb2bea0d1dde
Baumberg, Jeremy
44ce7dca-7035-4043-9a92-3e8a69a31f72
Zoorob, Majd
69c3efc0-d0b0-412f-9db1-8175ad24e29a
Charlton, Martin
fcf86ab0-8f34-411a-b576-4f684e51e274
Mahnkopf, Sven
90f15d1c-cd7d-444a-a775-dc6b7a4afa03
Netti, Maria
069d2df5-4ac5-44c2-8f1d-b8a8d1b4948e
Duncan, Michael
6d0ce7bc-b95f-4819-90f4-2201c3142bc5
Perney, Nicholas M.B.
c3fafd4b-a157-4ae3-bb19-eb2bea0d1dde
Baumberg, Jeremy
44ce7dca-7035-4043-9a92-3e8a69a31f72
Zoorob, Majd
69c3efc0-d0b0-412f-9db1-8175ad24e29a
Charlton, Martin
fcf86ab0-8f34-411a-b576-4f684e51e274
Mahnkopf, Sven
90f15d1c-cd7d-444a-a775-dc6b7a4afa03
Netti, Maria
069d2df5-4ac5-44c2-8f1d-b8a8d1b4948e
Duncan, Michael
6d0ce7bc-b95f-4819-90f4-2201c3142bc5

Perney, Nicholas M.B., Baumberg, Jeremy, Zoorob, Majd, Charlton, Martin, Mahnkopf, Sven and Netti, Maria , Duncan, Michael (ed.) (2006) Tuning localized plasmons in nanostructured substrates for surface-enhanced Raman scattering. Optics Express, 14 (2), 847-857. (doi:10.1364/OPEX.14.000847).

Record type: Article

Abstract

Comprehensive reflectivity mapping of the angular dispersion of nanostructured arrays comprising of inverted pyramidal pits is demonstrated. By comparing equivalently structured dielectric and metallic arrays, diffraction and plasmonic features are readily distinguished. While the diffraction features match expected theory, localised plasmons are also observed with severely flattened energy dispersions. Using pit arrays with identical pitch, but graded pit dimensions, energy scaling of the localised plasmon is observed. These localised plasmons are found to match a simple model which confines surface plasmons onto the pit sidewalls thus allowing an intuitive picture of the plasmons to be developed. This model agrees well with a 2D finite-difference time-domain simulation which shows the same dependence on pit dimensions. We believe these tuneable plasmons are responsible for the surface-enhancement of the Raman scattering (SERS) of an attached layer of benzenethiol molecules. Such SERS substrates have a wide range of applications both in security, chemical identification, environmental monitoring and healthcare.

Text
847.pdf - Other
Download (861kB)
Text
OptExp05.pdf - Other
Download (1MB)

More information

Published date: 2006
Keywords: Surface plasmons Diffraction theory Metals, optics of Spectroscopy, Raman Gratings
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 262353
URI: http://eprints.soton.ac.uk/id/eprint/262353
ISSN: 1094-4087
PURE UUID: 99940566-1a84-4cb0-8f33-ac5769664f71

Catalogue record

Date deposited: 12 Apr 2006
Last modified: 29 Jan 2020 15:49

Export record

Altmetrics

Contributors

Author: Nicholas M.B. Perney
Author: Jeremy Baumberg
Author: Majd Zoorob
Author: Martin Charlton
Author: Sven Mahnkopf
Author: Maria Netti
Editor: Michael Duncan

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×