scholarly journals Anisotropic wave propagation in nematic liquid crystals

Soft Matter ◽  
2014 ◽  
Vol 10 (41) ◽  
pp. 8296-8307 ◽  
Author(s):  
Paolo Biscari ◽  
Antonio DiCarlo ◽  
Stefano S. Turzi
Keyword(s):  
Wave Propagation ◽  
Liquid Crystals ◽  
Elastic Anisotropy ◽  
Nematic Liquid Crystals

We show that elastic anisotropy and relaxation are at the origin of the main experimental features of nematoacoustics.

New structure induced by elastic anisotropy in cylindrical nematic liquid crystal

2017 ◽  
Vol 13 (2) ◽  
pp. 4705-4717
Author(s):  
Zhang Qian ◽  
Zhou Xuan ◽  
Zhang Zhidong
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Elastic Anisotropy ◽  
Nematic Liquid Crystals ◽  
Gennes Theory

Basing on Landau–de Gennes theory, this study investigated the chiral configurations of nematic liquid crystals confined to cylindrical capillaries with homeotropic anchoring on the cylinder walls. When the elastic anisotropy (L2/L1) is large enough, a new structure results from the convergence of two opposite escape directions of the heterochiral twist and escape radial (TER) configurations. The new defect presents when L2/L1≥7 and disappears when L2/L1<7. The new structure possesses a heterochiral hyperbolic defect at the center and two homochiral radial defects on both sides. The two radial defects show different chiralities.

scholarly journals Elastic director vibrations in nematic liquid crystals

2014 ◽  
Vol 26 (1) ◽  
pp. 93-107 ◽  
Author(s):  
STEFANO S. TURZI
Keyword(s):  
Wave Propagation ◽  
Liquid Crystals ◽  
Sound Wave ◽  
Soft Matter ◽  
Nematic Liquid Crystals ◽  
Molecular Relaxation ◽  
Molecular Distribution ◽  
Nematic Elastomers ◽  
Small Anisotropy

Recently Biscari, DiCarlo and Turzi [Anisotropic wave propagation in nematic liquid crystals, Soft Matter 10, 8296–8307.] proposed a theory for nematoacustics which models nematic liquid crystals as nematic elastomers with molecular relaxation. Here, we extend the analysis of this theory to account for the director motion possibly induced by the propagation of a sound wave. We find that the director vibration is related to the - usually small - anisotropy of the molecular distribution, thus providing a justification to the relative high ultrasonic intensities required to observe non-negligible acousto-optic responses.

Tunable and programmable topological valley transport in photonic crystals with liquid crystals

2022 ◽  
Author(s):  
Yulin Zhao ◽  
Feng Liang ◽  
Xiangru Wang ◽  
Deshuang Zhao ◽  
Bing-Zhong Wang
Keyword(s):  
Wave Propagation ◽  
Liquid Crystals ◽  
Photonic Crystals ◽  
Symmetry Breaking ◽  
Relative Permittivity ◽  
Nematic Liquid Crystals ◽  
Inversion Symmetry ◽  
Edge States ◽  
Beam Splitting ◽  
Topological Transition

Abstract Topological valley transport in photonic crystals (PCs) has attracted great attention owing to its edge modes immune to backscattering. However, flexibly dynamically controlling and reconfiguring the pathway of the topological one-way propagation is still challenging. Here, we propose a tunable and programmable valley PC structure based on nematic liquid crystals (LCs). Inversion symmetry breaking and topological transition are implemented through controlling the relative permittivity of the LC cells. Topological protection of valley edge states and valley-locked beam splitting are demonstrated. Moreover, the LC-based PC can be discretized to a number of supercells, each of which can be coded with “0” or “1”. The wave propagation pathway can be dynamically reconfigured by programming different coding patterns.

Wave Propagation in Nematic Liquid Crystals

1971 ◽  
Vol 54 (12) ◽  
pp. 5027-5034 ◽  
Author(s):  
James D. Lee ◽  
A. Cemal Eringen
Keyword(s):  
Wave Propagation ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals

Nonlinear Wave Propagation and Spatial Solitons in Nematic Liquid Crystals

2003 ◽  
Vol 12 (02) ◽  
pp. 123-134 ◽  
Author(s):  
Gaetano Assanto ◽  
Marco Peccianti ◽  
Katarzyna A. Brzdakiewicz ◽  
Antonio de Luca ◽  
Caesar Umeton
Keyword(s):  
Wave Propagation ◽  
Liquid Crystals ◽  
Nonlinear Wave ◽  
Nonlinear Response ◽  
Nematic Liquid Crystals ◽  
Weak Signal ◽  
Spatial Solitons ◽  
Nonlinear Wave Propagation ◽  
Soliton Interactions ◽  
Planar Cells

Optical spatial solitons have been demonstrated in bulk nematic liquid crystals. We present an overview of our recent experimental results on nonlinear wave propagation in nematic liquid crystals, focusing on spatial solitons through the reorientational nonlinear response. Various phenomena, including spatial readdressing, weak signal guiding and two-soliton interactions, are observed in voltage biased planar cells.

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