6 October 2005 Tunable liquid crystal waveguide devices for filter and sensor applications
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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.
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I. J. G. Sparrow, I. J. G. Sparrow, A. Dyadyusha, A. Dyadyusha, M. Kaczmarek, M. Kaczmarek, G. D. Emmerson, G. D. Emmerson, P. G. R. Smith, P. G. R. Smith, "Tunable liquid crystal waveguide devices for filter and sensor applications", Proc. SPIE 5947, Liquid Crystals: Optics and Applications, 59470K (6 October 2005); doi: 10.1117/12.623177; https://doi.org/10.1117/12.623177
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