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Sensitivity enhancement of integrated optical sensors by use of thin high-index films

Sensitivity enhancement of integrated optical sensors by use of thin high-index films
Sensitivity enhancement of integrated optical sensors by use of thin high-index films
The proportion of power carried in the superstrate medium by the guided modes of integrated optical waveguides can be increased by the addition of a thin high index film. Enhanced refractive index sensing is demonstrated using channel waveguide Mach-Zehnder interferometers with Ta2O5 overlayers. Sensitivity increases by a factor greater than 50, and a detection limit better than 5x10-7 are obtained. This approach is broadly applicable to sensing at waveguide surfaces where the strength of evanescent fields dictates performance.
0003-6935
6036-6039
Quigley, G.R.
7d719dee-8822-4f48-9a29-52c7bc000a27
Harris, R.D.
e972b676-3335-44cd-b6e8-0dae17c550c3
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Quigley, G.R.
7d719dee-8822-4f48-9a29-52c7bc000a27
Harris, R.D.
e972b676-3335-44cd-b6e8-0dae17c550c3
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca

Quigley, G.R., Harris, R.D. and Wilkinson, J.S. (1999) Sensitivity enhancement of integrated optical sensors by use of thin high-index films. Applied Optics, 38 (28), 6036-6039. (doi:10.1364/AO.38.006036).

Record type: Article

Abstract

The proportion of power carried in the superstrate medium by the guided modes of integrated optical waveguides can be increased by the addition of a thin high index film. Enhanced refractive index sensing is demonstrated using channel waveguide Mach-Zehnder interferometers with Ta2O5 overlayers. Sensitivity increases by a factor greater than 50, and a detection limit better than 5x10-7 are obtained. This approach is broadly applicable to sensing at waveguide surfaces where the strength of evanescent fields dictates performance.

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Published date: 1999
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Identifiers

Local EPrints ID: 77777
URI: http://eprints.soton.ac.uk/id/eprint/77777
DOI: doi:10.1364/AO.38.006036
ISSN: 0003-6935
PURE UUID: f404570a-4fbe-4d75-a4a8-f03414ca5057
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:32

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Contributors

Author: G.R. Quigley
Author: R.D. Harris
Author: J.S. Wilkinson ORCID iD

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