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Surface and waveguide collection of Raman emission in waveguide-enhanced Raman spectroscopy

Surface and waveguide collection of Raman emission in waveguide-enhanced Raman spectroscopy
Surface and waveguide collection of Raman emission in waveguide-enhanced Raman spectroscopy
We demonstrate Raman spectroscopy on a high index thin film tantalum pentoxide waveguide and compare collection of Raman emission from the waveguide end with that from the waveguide surface. Toluene was used as a convenient model analyte, and a 40-fold greater signal was collected from the waveguide end. Simulations of angular and spatial Raman emission distributions showed good agreement with experiments, with the enhancement resulting from efficient collection of power from dipoles near the surface into the high-index waveguide film and substrate, combined with long interaction length. The waveguide employed was optimized at the excitation wavelength but not at emission wavelengths, and full optimization is expected to lead to enhancements comparable to surface-enhanced Raman spectroscopy in robust low-cost metal-free and nanostructure-free chips.
0146-9592
4146-4149
Wang, Zilong
4f6f5b53-bbc7-4f1f-9803-fbec5b88dc29
Zervas, Michael
1840a474-dd50-4a55-ab74-6f086aa3f701
Bartlett, Philip
d99446db-a59d-4f89-96eb-f64b5d8bb075
Wilkinson, James
73483cf3-d9f2-4688-9b09-1c84257884ca
Wang, Zilong
4f6f5b53-bbc7-4f1f-9803-fbec5b88dc29
Zervas, Michael
1840a474-dd50-4a55-ab74-6f086aa3f701
Bartlett, Philip
d99446db-a59d-4f89-96eb-f64b5d8bb075
Wilkinson, James
73483cf3-d9f2-4688-9b09-1c84257884ca

Wang, Zilong, Zervas, Michael, Bartlett, Philip and Wilkinson, James (2016) Surface and waveguide collection of Raman emission in waveguide-enhanced Raman spectroscopy. Optics Letters, 41 (17), 4146-4149. (doi:10.1364/OL.41.004146).

Record type: Article

Abstract

We demonstrate Raman spectroscopy on a high index thin film tantalum pentoxide waveguide and compare collection of Raman emission from the waveguide end with that from the waveguide surface. Toluene was used as a convenient model analyte, and a 40-fold greater signal was collected from the waveguide end. Simulations of angular and spatial Raman emission distributions showed good agreement with experiments, with the enhancement resulting from efficient collection of power from dipoles near the surface into the high-index waveguide film and substrate, combined with long interaction length. The waveguide employed was optimized at the excitation wavelength but not at emission wavelengths, and full optimization is expected to lead to enhancements comparable to surface-enhanced Raman spectroscopy in robust low-cost metal-free and nanostructure-free chips.

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Accepted/In Press date: 12 August 2016
e-pub ahead of print date: 1 September 2016
Published date: 1 September 2016
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 399406
URI: http://eprints.soton.ac.uk/id/eprint/399406
ISSN: 0146-9592
PURE UUID: 91ee604e-378a-47f1-9619-35e0eeda75b7
ORCID for Michael Zervas: ORCID iD orcid.org/0000-0002-0651-4059
ORCID for Philip Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for James Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

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Date deposited: 15 Aug 2016 15:18
Last modified: 18 Feb 2021 16:40

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Contributors

Author: Zilong Wang
Author: Michael Zervas ORCID iD
Author: Philip Bartlett ORCID iD
Author: James Wilkinson ORCID iD

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