scholarly journals Determination of viscoelastic coefficients from the optical transmission of a planar liquid crystal cell with low‐frequency modulated voltage

1993 ◽  
Vol 74 (10) ◽  
pp. 6053-6057 ◽  
Author(s):  
H. Schmiedel ◽  
R. Stannarius ◽  
M. Grigutsch ◽  
R. Hirning ◽  
J. Stelzer ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Transmission ◽  
Low Frequency ◽  
Liquid Crystal Cell ◽  
Crystal Cell

scholarly journals Topological transitions in an oscillatory driven liquid crystal cell

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Marcel G. Clerc ◽  
Michał Kowalczyk ◽  
Valeska Zambra
Keyword(s):  
Liquid Crystal ◽  
Topological States Of Matter ◽  
Low Frequency ◽  
Vortex State ◽  
Liquid Crystal Cell ◽  
Topological Transition ◽  
Exotic States ◽  
Crystal Cell ◽  
Topological States ◽  
Topological Transitions

Abstract Matter under different equilibrium conditions of pressure and temperature exhibits different states such as solid, liquid, gas, and plasma. Exotic states of matter, such as Bose–Einstein condensates, superfluidity, chiral magnets, superconductivity, and liquid crystalline blue phases are observed in thermodynamic equilibrium. Rather than being a result of an aggregation of matter, their emergence is due to a change of a topological state of the system. These topological states can persist out of thermodynamics equilibrium. Here we investigate topological states of matter in a system with injection and dissipation of energy by means of oscillatory forcing. In an experiment involving a liquid crystal cell under the influence of a low-frequency oscillatory electric field, we observe a transition from a non-vortex state to a state in which vortices persist, topological transition. Depending on the period and the type of the forcing, the vortices self-organise, forming square lattices, glassy states, and disordered vortex structures. The bifurcation diagram is characterised experimentally. A continuous topological transition is observed for the sawtooth and square forcings. The scenario changes dramatically for sinusoidal forcing where the topological transition is discontinuous, which is accompanied by serial transitions between square and glassy vortex lattices. Based on a stochastic amplitude equation, we recognise the origin of the transition as the balance between stochastic creation and deterministic annihilation of vortices. Numerical simulations show topological transitions and the emergence of square vortex lattice. Our results show that the matter maintained out of equilibrium by means of the temporal modulation of parameters can exhibit exotic states.

scholarly journals Field-symmetrization to solve luminance deviation between frames in a low-frequency-driven fringe-field switching liquid crystal cell

2016 ◽  
Vol 24 (26) ◽  
pp. 29568 ◽  
Author(s):  
Min Su Kim ◽  
Philip J. Bos ◽  
Dong-Woo Kim ◽  
Chang-Min Keum ◽  
Deng-Ke Yang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Low Frequency ◽  
Liquid Crystal Cell ◽  
Fringe Field ◽  
Crystal Cell
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