In vacuo measurement of the sensitivity limit of planar Bragg grating sensors for monolayer detection
In vacuo measurement of the sensitivity limit of planar Bragg grating sensors for monolayer detection
An exposed Bragg grating incorporated into a planar waveguide was used to form an optical device that acts as a refractive index sensor. The exposed evanescent field causes the Bragg peak to be sensitive to the refractive index of its surroundings. The corresponding shift in peak wavelength can be used to detect changes in this environment. Incorporation of a high index overlayer onto the surface has been shown to dramatically enhance this sensitivity. The sensitivity limit was measured via the deposition of a thin film of silica, demonstrating that the system can measure down to a single surface monolayer.
bragg gratings, fibre optic sensors, optical planar waveguides
Parker, Richard M.
b052ca4d-b6c7-4fdd-a2f9-45032f0ff13f
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Grossel, Martin C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
26 October 2009
Parker, Richard M.
b052ca4d-b6c7-4fdd-a2f9-45032f0ff13f
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Grossel, Martin C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Parker, Richard M., Gates, James C., Grossel, Martin C. and Smith, Peter G.R.
(2009)
In vacuo measurement of the sensitivity limit of planar Bragg grating sensors for monolayer detection.
Applied Physics Letters, 95 (17), [173306].
(doi:10.1063/1.3257727).
Abstract
An exposed Bragg grating incorporated into a planar waveguide was used to form an optical device that acts as a refractive index sensor. The exposed evanescent field causes the Bragg peak to be sensitive to the refractive index of its surroundings. The corresponding shift in peak wavelength can be used to detect changes in this environment. Incorporation of a high index overlayer onto the surface has been shown to dramatically enhance this sensitivity. The sensitivity limit was measured via the deposition of a thin film of silica, demonstrating that the system can measure down to a single surface monolayer.
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Published date: 26 October 2009
Keywords:
bragg gratings, fibre optic sensors, optical planar waveguides
Identifiers
Local EPrints ID: 178851
URI: http://eprints.soton.ac.uk/id/eprint/178851
ISSN: 0003-6951
PURE UUID: 7f09f3cf-44ba-48ec-bf8e-deb6026c05b5
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Date deposited: 31 Mar 2011 10:26
Last modified: 15 Mar 2024 03:07
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Author:
Richard M. Parker
Author:
James C. Gates
Author:
Peter G.R. Smith
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