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Applied Physics B

, Volume 81, Issue 1, pp 1–4 | Cite as

First order phase change detection using planar waveguide Bragg grating refractometer

  • I. J. G. SparrowEmail author
  • G. D. Emmerson
  • C. B. E. Gawith
  • P. G. R. Smith
  • M. Kaczmarek
  • A. Dyadyusha
Rapid Communication

Abstract

Solid-to-liquid and gas-to-liquid phase changes in water and ordered-to-isotropic phase changes in a nematic liquid crystal are detected with an optical sensor. A planar Bragg grating defined purely by refractive index modulation is covered with a water or liquid crystal overcladding and the temperature is controlled to trigger phase changes. Measurement of the Bragg wavelength allows changes of effective refractive index to be detected and discontinuities in behaviour caused by phase transitions can be clearly identified.

PACS

07.60.Hv 05.70.Fh 64.70.Md 64.70.Dv 64.70.Fx 42.79.Dj 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • I. J. G. Sparrow
    • 1
    Email author
  • G. D. Emmerson
    • 2
  • C. B. E. Gawith
    • 1
  • P. G. R. Smith
    • 1
  • M. Kaczmarek
    • 3
  • A. Dyadyusha
    • 3
  1. 1.Optoelectronics Research CentreUniversity of SouthamptonSouthamptonUK
  2. 2.Stratophase LtdRomsey, HampshireUK
  3. 3.School of Physics and AstronomyUniversity of SouthamptonSouthamptonUK

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