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Grating-incoupled waveguide-enhanced Raman sensor

Grating-incoupled waveguide-enhanced Raman sensor
Grating-incoupled waveguide-enhanced Raman sensor
We report a waveguide-enhanced Raman spectroscopy (WERS) platform with alignment-tolerant under-chip grating input coupling. The demonstration is based on a 100-nm thick planar (slab) tantalum pentoxide (Ta2O5) waveguide and the use of benzyl alcohol (BnOH) and its deuterated form (d7- BnOH) as reference analytes. The use of grating couplers simplifies the WERS system by providing improved translational alignment tolerance, important for disposable chips, as well as contributing to improved Raman conversion efficiency. The use of non-volatile, non-toxic BnOH and d7-BnOH as chemical analytes results in easily observable shifts in the Raman vibration lines between the two forms, making them good candidates for calibrating Raman systems. The design and fabrication of the waveguide and grating couplers are described, and a discussion of further potential improvements in performance is presented.
1932-6203
Ettabib, Mohamed A.
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Bowden, Bethany M.
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Liu, Zhen
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Marti, Almudena
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Churchill, Glenn M.
5933a331-fba3-444b-8352-273112c3d6a6
Gates, James C.
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Zervas, Michalis N.
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Bartlett, Philip N.
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Wilkinson, James S.
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Ettabib, Mohamed A.
fc8dd7d6-4cc6-410f-a837-8c522ad8734f
Bowden, Bethany M.
084eeee9-0c23-4d40-ab63-afd7574711fb
Liu, Zhen
ab2e4170-b059-48c1-8ac7-63ee8b8f10b3
Marti, Almudena
7988e501-cfca-4114-8314-41c001df20e5
Churchill, Glenn M.
5933a331-fba3-444b-8352-273112c3d6a6
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca

Ettabib, Mohamed A., Bowden, Bethany M., Liu, Zhen, Marti, Almudena, Churchill, Glenn M., Gates, James C., Zervas, Michalis N., Bartlett, Philip N. and Wilkinson, James S. (2023) Grating-incoupled waveguide-enhanced Raman sensor. PLoS ONE, 18 (8), [e0284058]. (doi:10.1371/journal.pone.0284058).

Record type: Article

Abstract

We report a waveguide-enhanced Raman spectroscopy (WERS) platform with alignment-tolerant under-chip grating input coupling. The demonstration is based on a 100-nm thick planar (slab) tantalum pentoxide (Ta2O5) waveguide and the use of benzyl alcohol (BnOH) and its deuterated form (d7- BnOH) as reference analytes. The use of grating couplers simplifies the WERS system by providing improved translational alignment tolerance, important for disposable chips, as well as contributing to improved Raman conversion efficiency. The use of non-volatile, non-toxic BnOH and d7-BnOH as chemical analytes results in easily observable shifts in the Raman vibration lines between the two forms, making them good candidates for calibrating Raman systems. The design and fabrication of the waveguide and grating couplers are described, and a discussion of further potential improvements in performance is presented.

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Accepted/In Press date: 22 March 2023
e-pub ahead of print date: 10 August 2023
Published date: August 2023
Additional Information: Funding Information: This work was funded by a grant from the UK Engineering and Physical Sciences Research Council (EPSRC), Grant Number EP/R011230/1. B. M.B. thanks the Defence Science and Technology Laboratory (contract no. DSTLX-1000128554) for supporting an EPSRC industrial CASE award. the funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Publisher Copyright: © 2023 Ettabib et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Identifiers

Local EPrints ID: 485529
URI: http://eprints.soton.ac.uk/id/eprint/485529
DOI: doi:10.1371/journal.pone.0284058
ISSN: 1932-6203
PURE UUID: 9baef54f-f23a-4f09-9c48-f0fa7e7490ce
ORCID for Bethany M. Bowden: ORCID iD orcid.org/0000-0002-2312-2727
ORCID for Almudena Marti: ORCID iD orcid.org/0000-0003-0860-3554
ORCID for Glenn M. Churchill: ORCID iD orcid.org/0000-0001-7621-7618
ORCID for James C. Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for Michalis N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059
ORCID for Philip N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for James S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

Catalogue record

Date deposited: 08 Dec 2023 17:32
Last modified: 30 Aug 2024 01:56

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Contributors

Author: Mohamed A. Ettabib
Author: Bethany M. Bowden ORCID iD
Author: Zhen Liu
Author: Almudena Marti ORCID iD
Author: Glenn M. Churchill ORCID iD
Author: James C. Gates ORCID iD
Author: Michalis N. Zervas ORCID iD
Author: Philip N. Bartlett ORCID iD
Author: James S. Wilkinson ORCID iD

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