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Disposable gold coated pyramidal SERS sensor on the plastic platform

Disposable gold coated pyramidal SERS sensor on the plastic platform
Disposable gold coated pyramidal SERS sensor on the plastic platform
In this paper we investigate suitability of arrays of gold coated pyramids for surface-enhanced Raman scattering (SERS) sensing applications. Pyramidarrays composed of 1000nm pit size with 1250nm pitch lengthwerereplicated on a plastic substrate by roll-to-roll (R2R) ultraviolet (UV) embossing. The level of SERS enhancement, and qualitative performance provided by the new substrate is investigated by comparing Raman spectrum of benzenethiol (BTh) test molecules to the benchmark Klarite SERS substrate which comprises inverted pyramid arrays(1500nm pit size with 2000nm pitch length) fabricated on a silicon substrate. The new substrate is found to provide upto 11 times increase in signal in comparison to the inverted pyramid (IV-pyramid) arrays fabricated on an identical plastic substrate. Numerical simulation and experimental evidence suggest that strongly confined electromagnetic fields close to the base of the pyramids, are mainly responsible for the Raman enhancement factor, instead of the fields localized around the tip. Unusually strong plasmon fields are projected upto 200nm from the sidewalls at the base of the pyramid increasing the cross sectional sensing volume.
surface-enhanced raman scattering (SERS), Senosrs, Plasmonics
1094-4087
724-731
Oo, S.Z.
6495f6da-8f17-4484-98fb-6151b4efbd9a
Siitonen, S.
08cde8b0-63f0-4c2d-ad9c-18a500701660
Kontturi, V.
c61ece18-8584-4c9b-8586-9833a14097a8
Eustace, D.A.
29fb6370-71d7-4214-a700-edb495575ae9
Charlton, M.D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274
Oo, S.Z.
6495f6da-8f17-4484-98fb-6151b4efbd9a
Siitonen, S.
08cde8b0-63f0-4c2d-ad9c-18a500701660
Kontturi, V.
c61ece18-8584-4c9b-8586-9833a14097a8
Eustace, D.A.
29fb6370-71d7-4214-a700-edb495575ae9
Charlton, M.D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274

Oo, S.Z., Siitonen, S., Kontturi, V., Eustace, D.A. and Charlton, M.D.B. (2016) Disposable gold coated pyramidal SERS sensor on the plastic platform. Optics Express, 24 (1), 724-731. (doi:10.1364/OE.24.000724).

Record type: Article

Abstract

In this paper we investigate suitability of arrays of gold coated pyramids for surface-enhanced Raman scattering (SERS) sensing applications. Pyramidarrays composed of 1000nm pit size with 1250nm pitch lengthwerereplicated on a plastic substrate by roll-to-roll (R2R) ultraviolet (UV) embossing. The level of SERS enhancement, and qualitative performance provided by the new substrate is investigated by comparing Raman spectrum of benzenethiol (BTh) test molecules to the benchmark Klarite SERS substrate which comprises inverted pyramid arrays(1500nm pit size with 2000nm pitch length) fabricated on a silicon substrate. The new substrate is found to provide upto 11 times increase in signal in comparison to the inverted pyramid (IV-pyramid) arrays fabricated on an identical plastic substrate. Numerical simulation and experimental evidence suggest that strongly confined electromagnetic fields close to the base of the pyramids, are mainly responsible for the Raman enhancement factor, instead of the fields localized around the tip. Unusually strong plasmon fields are projected upto 200nm from the sidewalls at the base of the pyramid increasing the cross sectional sensing volume.

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Disposable gold coated pyramidal SERS sensor on the plastic platform
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Published date: 11 January 2016
Keywords: surface-enhanced raman scattering (SERS), Senosrs, Plasmonics

Identifiers

Local EPrints ID: 428823
URI: https://eprints.soton.ac.uk/id/eprint/428823
ISSN: 1094-4087
PURE UUID: e3516737-edb3-4891-9e8f-64b37c6ba4c0

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Date deposited: 11 Mar 2019 17:30
Last modified: 02 Dec 2019 17:42

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Contributors

Author: S.Z. Oo
Author: S. Siitonen
Author: V. Kontturi
Author: D.A. Eustace
Author: M.D.B. Charlton

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