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Planar waveguide hygrometer and state sensor demonstrating supercooled water recognition

Planar waveguide hygrometer and state sensor demonstrating supercooled water recognition
Planar waveguide hygrometer and state sensor demonstrating supercooled water recognition
A sensor believed to be the first truly integrated optical sensor capable of detecting the liquid-solid phase transition of water is presented. The condensation, freezing, melting and evaporation of water are all detected with a planar silica Bragg grating operating in the 1.5 µm telecommunications window. Additionally, use of the sensor allows recognition of supercooled liquid at temperatures below the melting point of water.

The device, well suited for integrated optics, is fabricated by direct UV writing with simultaneous definition of the grating. The Bragg grating is exposed and water is allowed to condense over it. Interaction with the evanescent field causes small changes in effective index (5 x 10-6) which can be detected, a sufficient sensitivity to identify the phase transitions of water clearly.
bragg grating, planar waveguide, water, refractometer, integrated optical sensors
0925-4005
856-860
Sparrow, I.J.G.
3b11b080-98d5-41fe-8e15-bc12d17dc259
Emmerson, G.D.
89517051-daed-4f8e-aca6-f686d8c54e7c
Gawith, C.B.E.
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Sparrow, I.J.G.
3b11b080-98d5-41fe-8e15-bc12d17dc259
Emmerson, G.D.
89517051-daed-4f8e-aca6-f686d8c54e7c
Gawith, C.B.E.
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6

Sparrow, I.J.G., Emmerson, G.D., Gawith, C.B.E. and Smith, P.G.R. (2005) Planar waveguide hygrometer and state sensor demonstrating supercooled water recognition. Sensors and Actuators B: Chemical, 107 (2), 856-860. (doi:10.1016/j.snb.2004.12.027).

Record type: Article

Abstract

A sensor believed to be the first truly integrated optical sensor capable of detecting the liquid-solid phase transition of water is presented. The condensation, freezing, melting and evaporation of water are all detected with a planar silica Bragg grating operating in the 1.5 µm telecommunications window. Additionally, use of the sensor allows recognition of supercooled liquid at temperatures below the melting point of water.

The device, well suited for integrated optics, is fabricated by direct UV writing with simultaneous definition of the grating. The Bragg grating is exposed and water is allowed to condense over it. Interaction with the evanescent field causes small changes in effective index (5 x 10-6) which can be detected, a sufficient sensitivity to identify the phase transitions of water clearly.

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More information

Published date: 2005
Keywords: bragg grating, planar waveguide, water, refractometer, integrated optical sensors

Identifiers

Local EPrints ID: 30211
URI: https://eprints.soton.ac.uk/id/eprint/30211
ISSN: 0925-4005
PURE UUID: b38af14b-7dac-4a21-b202-3cabd208a5b1
ORCID for C.B.E. Gawith: ORCID iD orcid.org/0000-0002-3502-3558

Catalogue record

Date deposited: 11 May 2006
Last modified: 20 Jul 2019 01:08

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Contributors

Author: I.J.G. Sparrow
Author: G.D. Emmerson
Author: C.B.E. Gawith ORCID iD
Author: P.G.R. Smith

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