Beam coupling and coherent amplification in photorefractive liquid crystals under ac electric field

2007 ◽  
Author(s):  
Xiudong Sun ◽  
Yanbo Pei ◽  
Fengfeng Yao
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Ac Electric Field ◽  
Beam Coupling ◽  
Coherent Amplification

Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals

Soft Matter ◽  
2017 ◽  
Vol 13 (46) ◽  
pp. 8728-8735 ◽  
Author(s):  
Meina Yu ◽  
Huai Yang ◽  
Deng-Ke Yang
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Color Change ◽  
Cholesteric Liquid Crystals ◽  
Color Tuning ◽  
Ac Electric Field ◽  
Reflected Light ◽  
Periodic Layer

When subjected to an AC electric field perpendicular to its layers, the cholesteric planar state may undergo a periodic layer undulation, known as the Helfrich deformation, which generates a color change of the reflected light.

Numerical study of deformations induced by ac electric field in insulating flexoelectric nematic layers

2011 ◽  
Vol 19 (1) ◽  
Author(s):  
G. Derfel ◽  
M. Buczkowska
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Time Dependence ◽  
Critical Frequency ◽  
Numerical Study ◽  
Dielectric Anisotropy ◽  
Low Frequencies ◽  
High Frequencies ◽  
Ac Electric Field ◽  
Time Period

AbstractThe influence of the frequency f of applied ac electric field on the time dependence of electric field induced deformations of homeotropic nematic layers is studied numerically. Three kinds of nematic liquid crystals were considered: non-flexoelectric nematic with negative dielectric anisotropy, Δɛ < 0dielectrically compensated nematic (Δɛ = 0) possessing flexoelectric properties determined by the positive sum of flexoelectric coefficients e = e11 + e33 > 0nematic characterised by both Δɛ < 0 and e > 0.It was found that at sufficiently low frequencies, the deformations varied with time. The deformations of purely dielectric nature had the period 1/(2f). When the frequency was increased, a stationary director distribution was achieved, determined by the rms value of the ac voltage. The time period of purely flexoelectric distortions was equal to 1/f. There was a well defined cut-off frequency above which these deformations vanished. In the case of dielectrically anisotropic and flexoelectric nematic, the flexoelectric contribution vanished above a critical frequency and the deformation of dielectric nature stabilized at high frequencies.

Propelling and spinning of microsheets in nematic liquid crystals driven by ac electric field

2017 ◽  
Vol 95 (1) ◽  
Author(s):  
M. V. Rasna ◽  
U. V. Ramudu ◽  
R. Chandrasekar ◽  
Surajit Dhara
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Nematic Liquid Crystals ◽  
Ac Electric Field

scholarly journals Electrically driven formation and dynamics of Pac-Man solitons in smectic A liquid crystals

2021 ◽  
Author(s):  
Yuan Shen ◽  
Ingo Dierking
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Spatiotemporal Chaos ◽  
Practical Applications ◽  
Smectic A ◽  
Fundamental Science ◽  
Smectic A Liquid Crystals

Electric field driven instabilities of liquid crystals, such as electro-convections, spatiotemporal chaos, backflows, and solitons are of great importance for both fundamental science and practical applications. Here we demonstrate that...

Simulation of TiO 2 particle trajectory in AC electric field

2015 ◽  
Vol 108 ◽  
pp. 183-191 ◽  
Author(s):  
Reza Riahifar ◽  
Babak Raissi ◽  
Cyrus Zamani ◽  
Ehsan Marzbanrad
Keyword(s):  
Electric Field ◽  
Particle Trajectory ◽  
Ac Electric Field
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