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A Bragg grating sensor for detection of monolayers at a surface

A Bragg grating sensor for detection of monolayers at a surface
A Bragg grating sensor for detection of monolayers at a surface
Planar waveguides can be written with a UV-laser into photosensitized silica to produce a wide range of optical devices. Careful modulation of two interfering beams allows Bragg gratings to be directly written into the channel (Figure 1.a). These Bragg gratings are inherently sensitive to temperature and strain. However etching away the surface exposes the mode within the grating to its surroundings. The corresponding observed shift in Bragg wavelength can be used to detect changes in this environment [1]. Figure 1.b shows a large wavelength shift due to two analytes of markedly different refractive index. This demonstrates the apodised spectral response that in practice allows resolution of sub-picometer shifts in wavelength
Parker, R.M.
f81eb20a-6333-46e5-afb8-2413caa81f3e
Gates, J.C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Grossel, M.C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Parker, R.M.
f81eb20a-6333-46e5-afb8-2413caa81f3e
Gates, J.C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Grossel, M.C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56

Parker, R.M., Gates, J.C., Smith, P.G.R. and Grossel, M.C. (2009) A Bragg grating sensor for detection of monolayers at a surface. European Conference on Lasers and Electro-Optics (CLEO/Europe-EQEC). 14 - 19 Jun 2009.

Record type: Conference or Workshop Item (Paper)

Abstract

Planar waveguides can be written with a UV-laser into photosensitized silica to produce a wide range of optical devices. Careful modulation of two interfering beams allows Bragg gratings to be directly written into the channel (Figure 1.a). These Bragg gratings are inherently sensitive to temperature and strain. However etching away the surface exposes the mode within the grating to its surroundings. The corresponding observed shift in Bragg wavelength can be used to detect changes in this environment [1]. Figure 1.b shows a large wavelength shift due to two analytes of markedly different refractive index. This demonstrates the apodised spectral response that in practice allows resolution of sub-picometer shifts in wavelength

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More information

Published date: 14 June 2009
Venue - Dates: European Conference on Lasers and Electro-Optics (CLEO/Europe-EQEC), 2009-06-14 - 2009-06-19

Identifiers

Local EPrints ID: 78999
URI: https://eprints.soton.ac.uk/id/eprint/78999
PURE UUID: 1208b65b-934c-4d3e-a401-8383434a4f8b
ORCID for J.C. Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for M.C. Grossel: ORCID iD orcid.org/0000-0001-7469-6854

Catalogue record

Date deposited: 19 Mar 2010
Last modified: 06 Jun 2018 13:09

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