Optical diffraction by using electrically-controlled spatially patterned nematic pentylcyanobiphenyl films under static electric field |
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Authors: | Georgi B Hadjichristov Yordan G Marinov |
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Institution: | 1. Laboratory of Optics and Spectroscopy, Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgariageorgibh@issp.bas.bg;3. Laboratory of Biomolecular Layers, Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria |
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Abstract: | ABSTRACTDiffractive electro-optics of electrically-induced spatially periodic texture patterns (namely, wide-formed stationary parallel stripes) in planarly-aligned films of the nematic liquid crystal 4-n-pentyl-4′-cyanobiphenyl (5CB) is examined under static electric field in view of its practical application. The longitudinal textural domains electrically-induced with well defined threshold and spatial period have flexo-dielectric nature and differ from the usual flexoelectric stripe distortion, as well as from the electroconvective domains of frequency-dependent morphology. The low-voltage-controlled grating effect through the flexo-dielectric domains can be useful for nematic diffractive optics. |
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Keywords: | Nematics liquid crystals pentylcyanobiphenyls electro-optics optical phase grating spatially-periodic patterned array coherent light diffraction |
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