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01120 am a22001453u 4500 |
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15128 |
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|a dc
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|a Dyadyusha, A.
|e author
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|a Kaczmarek, M.
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|a Slussarenko, S.S.
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|a Dynamics and uniformity of reorientation in liquid crystal cells with PVK alignment layers
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|c 2003.
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|z Get fulltext
|u https://eprints.soton.ac.uk/15128/1/eLC03.pdf
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|a We present experimental results on dynamics of Freedericksz transition in liquid crystal cells with alignment layers made of poly(N-vinyl carbazole). DC electric field causes the build-up of, unusually strong, surface charge layers on a liquid crystal-polymer interface that screen liquid crystals from the external field. The process of surface charge build-up and discharge in illuminated areas takes place due to low dark conductivity and high photoconductivity of poly(N-vinyl carbazole), rather than due to its photorefractive nature. If the illuminating beam has a Gaussian profile, reorientation starts from a very small volume, with a clear disclination line in the reorientation spot.
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