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Photorefractive diffraction gratings were studied in cells of homeotropically aligned pentyl-cyanobiphenyl liquid crystal. These holographic gratings were induced by the simultaneous and nonsimultaneous application of dc and coherent optical electric fields. The observed behavior was consistent with a predominantly surface-mediated photorefractive effect. Beam coupling was observed in all cases and led to a model involving screened and unscreened interfacial trapped charges driving a modulation of the easy axis. Holographic gratings could be switched on and off by the application of a small voltage. 相似文献
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D. Andrienko Yu. Kurioz Yu. Reznikov V. Reshetnyak 《Journal of Experimental and Theoretical Physics》1997,85(6):1119-1124
Surface driven reorientation effects in a nematic liquid crystal cell caused by light-induced changes of the anchoring parameters
were studied. Theoretical consideration of one-dimensional flat distributions of the director has shown that the director
can undergo threshold reorientation between hybrid, homeotropic, and planar alignments as the anchoring energy varies continuously.
The threshold reorientation takes place when the reference and light-induced easy axes are perpendicular. In the one-elastic-constant
approximation the light-induced transition was found to be of second order as shown by a critical increase of the director
thermal fluctuations in the vicinity of the transition point. These effects were experimentally studied in the cells containing
5CB liquid crystal aligned by the photosensitive azo-containing polymer layer.
Zh. éksp. Teor. Fiz. 112, 2045–2055 (December 1997)
Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor. 相似文献
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Filippov A. V. Reshetnyak V. V. Starostin A. N. Tkachenko I. M. Fortov V. E. 《JETP Letters》2019,110(10):659-666
JETP Letters - The electrostatic interaction between charged particles in a dusty plasma has been studied using the Ornstein—Zernike integral equation for a multicomponent plasma. The... 相似文献
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A. A. Reshetnyak 《Physics of Particles and Nuclei》2012,43(5):689-693
We review the details of unconstrained Lagrangian formulations for Bose particles propagated on an arbitrary dimensional flat space-time and described by the unitary irreducible integer higher-spin representations of the Poincare group subject to Young tableaux Y(s 1, ..., s k ) with k rows. The procedure is based on the construction of scalar auxiliary oscillator realizations for the symplectic sp(2k) algebra which encodes the second-class operator constraints subsystem in the HS symmetry algebra. Application of an universal BRST approach reproduces gauge-invariant Lagrangians with reducible gauge symmetries describing the free dynamics of both massless and massive bosonic fields of any spin with appropriate number of auxiliary fields. 相似文献