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Proceedings Paper

Light transmission loss in liquid crystal waveguides
Author(s): Edward Nowinowski-Kruszelnicki; Andrzej Walczak; Aleksander Kiezun; Leszek R. Jaroszewicz
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Paper Abstract

The investigation results of the propagation loss due to light scattering in electrically induced channel in planar waveguides are presented. The channel structure was obtained by means of electric driven stripe electrode made by photolithographic process. Planar waveguiding cell has been fabricated using ITO/SiO2/polyimide-coated glass plates and LC film 20 micrometers thick. A nematic liquid crystal layer with 90 degrees-twisted nematic orientation was studied. The He-Ne light beam was endfire coupled into an input edge of a waveguide using an objective lens. The propagation loss have been evaluated from the spatial variation intensity of light scattered out perpendicularly to the waveguide surface along the light propagation direction measured with CCD camera. Loss measurements have been made in room temperature. Waveguiding channel effect has been observed above 2.5 Vrms of applied voltage with the loss of about 17 +/- 1 dB. Increased driving voltage up to 100 Vrms reduces the loss to minimum value of 12 +/- 1 dB/cm. As a result of the experiments one may conclude that transmission loss in thick nematic waveguide have bulk character caused by imperfection of molecular alignment.

Paper Details

Date Published: 1 February 1998
PDF: 4 pages
Proc. SPIE 3318, Liquid Crystals: Physics, Technology, and Applications, (1 February 1998); doi: 10.1117/12.300014
Show Author Affiliations
Edward Nowinowski-Kruszelnicki, Military Univ. of Technology (Poland)
Andrzej Walczak, Military Univ. of Technology (Poland)
Aleksander Kiezun, Military Univ. of Technology (Poland)
Leszek R. Jaroszewicz, Military Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 3318:
Liquid Crystals: Physics, Technology, and Applications

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