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Proceedings Paper

Tunable liquid crystal waveguide devices for filter and sensor applications
Author(s): I. J. G. Sparrow; A. Dyadyusha; M. Kaczmarek; G. D. Emmerson; P. G. R. Smith
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Paper Abstract

We report on the experimental demonstration of electrically tunable Bragg grating using liquid crystals. Such concept and device have been modelled in the past, but not realised experimentally. Using Direct UV writing technique, a waveguide and Bragg grating are simultaneously patterned in a planar silica on silicon substrate. Overcladding in the vicinity of the grating can be replaced by liquid crystals to exploit their electro-optic properties. The interactions of the evanescent field with the variable refractive index of the liquid crystal allow the tuning of the centre wavelength of the filter. In this way a 35 GHz tunable planar Bragg grating using liquid crystal and electric field was demonstrated.

Paper Details

Date Published: 6 October 2005
PDF: 6 pages
Proc. SPIE 5947, Liquid Crystals: Optics and Applications, 59470K (6 October 2005); doi: 10.1117/12.623177
Show Author Affiliations
I. J. G. Sparrow, Univ. of Southampton (United Kingdom)
A. Dyadyusha, Univ. of Southampton (United Kingdom)
M. Kaczmarek, Univ. of Southampton (United Kingdom)
G. D. Emmerson, Stratophase Ltd. (United Kingdom)
P. G. R. Smith, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 5947:
Liquid Crystals: Optics and Applications
Tomasz R. Wolinski; Marc Warenghem; Shin-Tson Wu, Editor(s)

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