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Optimized design for grating-coupled waveguide-enhanced Raman spectroscopy

Optimized design for grating-coupled waveguide-enhanced Raman spectroscopy
Optimized design for grating-coupled waveguide-enhanced Raman spectroscopy
We report a new design optimization process for planar photonic waveguides applied to waveguide-enhanced Raman spectroscopy (WERS) that combines the optimization of both the surface intensity performance and the grating coupling efficiency. We consider the impact of film thickness on the grating coupling efficiency of two materials with different refractive indices, namely tantalum pentoxide (Ta2O5) and silicon (Si). We propose a new figure-of-merit (FOM) that takes into account both the coupling efficiency and surface intensity dependence for Raman excitation on the film thickness. Our study shows that the optimum surface-sensitive waveguide thickness is thinner than the optimum coupling efficiency thickness for both material systems. As an example, for a tantalum pentoxide waveguide operating at 785 nm, our optimization strategy proposes a 20% increase in waveguide core thickness relative to the optimum surface-sensitive thickness to achieve the best performance in WERS applications. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
1094-4087
37226-37235
Ettabib, Mohamed A.
71b98cd3-9b2a-4f73-b4c2-0f4b59cacf50
Liu, Zhen
ab2e4170-b059-48c1-8ac7-63ee8b8f10b3
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Ettabib, Mohamed A.
71b98cd3-9b2a-4f73-b4c2-0f4b59cacf50
Liu, Zhen
ab2e4170-b059-48c1-8ac7-63ee8b8f10b3
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca

Ettabib, Mohamed A., Liu, Zhen, Zervas, Michalis N. and Wilkinson, James S. (2020) Optimized design for grating-coupled waveguide-enhanced Raman spectroscopy. Optics Express, 28 (25), 37226-37235. (doi:10.1364/OE.410602).

Record type: Article

Abstract

We report a new design optimization process for planar photonic waveguides applied to waveguide-enhanced Raman spectroscopy (WERS) that combines the optimization of both the surface intensity performance and the grating coupling efficiency. We consider the impact of film thickness on the grating coupling efficiency of two materials with different refractive indices, namely tantalum pentoxide (Ta2O5) and silicon (Si). We propose a new figure-of-merit (FOM) that takes into account both the coupling efficiency and surface intensity dependence for Raman excitation on the film thickness. Our study shows that the optimum surface-sensitive waveguide thickness is thinner than the optimum coupling efficiency thickness for both material systems. As an example, for a tantalum pentoxide waveguide operating at 785 nm, our optimization strategy proposes a 20% increase in waveguide core thickness relative to the optimum surface-sensitive thickness to achieve the best performance in WERS applications. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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More information

Accepted/In Press date: 29 October 2020
Published date: 7 December 2020
Additional Information: The authors thank the Engineering and Physical Sciences Research Council (EPSRC) for funding support and Prof. Philip N. Bartlett for valuable discussions and careful reading of the manuscript.

Identifiers

Local EPrints ID: 472456
URI: http://eprints.soton.ac.uk/id/eprint/472456
ISSN: 1094-4087
PURE UUID: d3f022ba-6a37-4ad5-a466-f7533147859e
ORCID for Michalis N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059
ORCID for James S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

Catalogue record

Date deposited: 06 Dec 2022 17:31
Last modified: 18 Mar 2024 02:38

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