scholarly journals Beam Propagation in Nematic Liquid Crystals

2007 ◽  
Vol 112 (5) ◽  
pp. 877-883 ◽  
Author(s):  
A.I. Strinic ◽  
M.R. Belic
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Beam Propagation

scholarly journals Mechanical analogies for nonlinear light beams in nonlocal nematic liquid crystals

2018 ◽  
Vol 27 (04) ◽  
pp. 1850046 ◽  
Author(s):  
Gaetano Assanto ◽  
Panayotis Panayotaros ◽  
Noel F. Smyth
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Type Equation ◽  
Beam Propagation ◽  
Dimensional System ◽  
Dynamical Equations ◽  
Approximate Methods ◽  
Existence And Stability ◽  
Nonlinear Features ◽  
Light Beams

The equations governing nonlinear light beam propagation in nematic liquid crystals form a [Formula: see text]-dimensional system consisting of a nonlinear Schrödinger-type equation for the electric field of the wavepacket and an elliptic equation for the reorientational response of the medium. The latter is “nonlocal” in the sense that it is much wider than the size of the beam. Due to these nonlocal, nonlinear features, there are no known general solutions of the nematic equations; hence, approximate methods have been found convenient to analyze nonlinear beam propagation in such media, particularly the approximation of solitary waves as mechanical particles moving in a potential. We review the use of dynamical equations to analyze solitary wave propagation in nematic liquid crystals through a number of examples involving their trajectory control, including comparisons with experimental results from the literature. Finally, we make a few general remarks on the existence and stability of optically self-localized solutions of the nematic equations.

scholarly journals Possibility of discrete beam propagation in chiral nematic liquid crystals

2009 ◽  
Vol 1 (4) ◽  
Author(s):  
MichaĹ‚ KwaĹ›ny ◽  
Urszula A. Laudyn ◽  
PaweĹ‚ Jung ◽  
Mirosław A. Karpierz
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Beam Propagation ◽  
Chiral Nematic

scholarly journals Beam splitting in chiral nematic liquid crystals

2018 ◽  
Vol 10 (4) ◽  
pp. 109
Author(s):  
Filip Sala
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Soft Matter ◽  
Nematic Liquid Crystals ◽  
Beam Propagation Method ◽  
Beam Propagation ◽  
Optical Solitons ◽  
Molecular Reorientation ◽  
Chiral Nematic

By lunching the beam into the chiral nematic liquid crystals it is possible to achieve a non-diffractive beam similar to a soliton. This effect is caused by the molecular reorientation i.e. nonlinear response of the material forming the areas of higher refractive index. Diffraction is suppressed by the focusing effect. For appropriate launching conditions it is also possible to achieve a beam which splits into two or more separate beams. Such phenomenon is discussed in this article and analyzed theoretical. To model this effect Fully Vectorial Beam Propagation Method coupled with the Frank-Oseen elastic theory is used. Simulations are performed for various input beam powers, widths, polarization angles and launching positions. Full Text: PDF ReferencesG. Assanto and M. A. Karpierz, "Nematicons: self-localised beams in nematic liquid crystals", Liq. Cryst. 36, 1161–1172 (2009) CrossRef G. Assanto, Nematicons: Spatial Optical Solitons in Nematic Liquid Crystals, John Wiley & Sons Inc. Hoboken, New Jersey (2013) DirectLink A. Piccardi, A. Alberucci, U. Bortolozzo, S. Residori, and G. Assanto, "Soliton gating and switching in liquid crystal light valve", Appl. Phys. Lett. 96, 071104 (2010). CrossRef D. Melo, I. Fernandes, F. Moraes, S. Fumeron, and E. Pereira, "Thermal diode made by nematic liquid crystal", Phys. Lett. A 380, 3121 – 3127 (2016). CrossRef U. Laudyn, M. Kwaśny, F. A. Sala, M. A. Karpierz, N. F. Smyth, G. Assanto, "Curved optical solitons subject to transverse acceleration in reorientational soft matter", Sci. Rep. 7, 12385 (2017) CrossRef M. Kwaśny, U. A. Laudyn, F. A. Sala, A. Alberucci, M. A. Karpierz, G. Assanto, "Self-guided beams in low-birefringence nematic liquid crystals", Phys. Rev. A 86, 013824 (2012) CrossRef F. A. Sala, M. M. Sala-Tefelska, "Optical steering of mutual capacitance in a nematic liquid crystal cell", J. Opt. Soc. Am. B. 35, 133-139 (2018) CrossRef U. A. Laudyn, A. Piccardi, M. Kwasny, M. A. Karpierz, G. Assanto, "Thermo-optic soliton routing in nematic liquid crystals", Opt. Lett. 43, 2296-2299 (2018) CrossRef F. A. Sala, M. M. Sala-Tefelska, M. J. Bujok, J. "Influence of temperature diffusion on molecular reorientation in nematic liquid crystals", Nonlinear Opt. Phys. Mater. 27, 1850011 (2018) CrossRef I-C Khoo Liquid crystals John Wiley & Sons, Inc (2007) DirectLink P. G. de Gennes, J. Prost, The Physics of Liquid Crystals, Clarendon Press (1995) DirectLink U. A. Laudyn, P. S. Jung, M. A. Karpierz, G. Assanto, "Quasi two-dimensional astigmatic solitons in soft chiral metastructures", Sci. Rep. 6, 22923 (2016) CrossRef J. Beeckman, A. Madani, P. J. M. Vanbrabant, P. Henneaux, S-P. Gorza, M. Haelterman, "Switching and intrinsic position bistability of soliton beams in chiral nematic liquid crystals", Phys. Rev. A 83, 033832 (2011) CrossRef A. Madani, J. Beeckman, K. Neyts, "An experimental observation of a spatial optical soliton beam and self splitting of beam into two soliton beams in chiral nematic liquid crystal", Opt. Commun. 298–299, 222-226, (2013) CrossRef G. D. Ziogos, E. E. Kriezis, "Modeling light propagation in liquid crystal devices with a 3-D full-vector finite-element beam propagation method", Opt. Quant. Electron 40, 10 (2008) CrossRef F. A. Sala, M. A. Karpierz, "Chiral and nonchiral nematic liquid-crystal reorientation induced by inhomogeneous electric fields", J. Opt. Soc. Am. B 29, 1465-1472 (2012) CrossRef F. A. Sala, M. A. Karpierz, "Modeling of molecular reorientation and beam propagation in chiral and non-chiral nematic liquid crystals", Opt. Express 20, 13923-13938 (2012) CrossRef F. A. Sala, "Design of false color palettes for grayscale reproduction", Displays, 46, 9-15 (2017) CrossRef

Laser Beam Induces Reorientation in Nematic Liquid Crystals

2010 ◽  
Vol 428-429 ◽  
pp. 224-227
Author(s):  
I Min Jiang ◽  
Yu Jen Chen ◽  
Wen Chi Hung ◽  
C.T. Kuo ◽  
D.J. Jang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Laser Beam ◽  
Nematic Liquid Crystals ◽  
Beam Propagation ◽  
Isotropic Phase ◽  
Optical Alignment ◽  
Optically Induced

Nematic liquid crystals (NLCs) can be easily reoriented by the laser beam at the temperature closed to the nematic–isotropic phase transition (TNI). At the temperature closed to TNI, the propagating mode of laser beam and the optically induced phase transition were explored by using a microscopic conoscope technique. This investigation demonstrates the formation of soliton at particular beam propagation modes. The interaction between nematic liquid crystals and the laser beam with different polarizations showed the nonlinearity in optical alignment.

DISSIPATIVE SELF-CONFINED OPTICAL BEAMS IN DOPED NEMATIC LIQUID CRYSTALS

2007 ◽  
Vol 16 (03) ◽  
pp. 295-305 ◽  
Author(s):  
ALESSANDRO ALBERUCCI ◽  
GAETANO ASSANTO
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Optical Gain ◽  
Beam Propagation ◽  
Optical Amplification ◽  
Nonlinear Beam ◽  
Light Localization ◽  
Non Local ◽  
Optical Beams

We study light localization in nonlinear non-local nematic liquid crystals capable of optical gain. We address the role of optical amplification on nonlinear beam propagation, considering various forms of gain and configurations.

NEMATICONS PROPERTIES AND STABILITY IN CHIRAL NEMATIC LIQUID CRYSTAL

2012 ◽  
Vol 21 (03) ◽  
pp. 1250036 ◽  
Author(s):  
URSZULA A. LAUDYN ◽  
FILIP A. SALA ◽  
MIROSŁAW A. KARPIERZ
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Light Beam ◽  
Nematic Liquid Crystal ◽  
Nematic Liquid Crystals ◽  
Beam Propagation ◽  
Numerical Results ◽  
Spatial Solitons ◽  
High Birefringence ◽  
Chiral Nematic

We report on the experimental and numerical results of the nonlinear light beam propagation in planar samples of chiral nematic liquid crystals, for both high- and low-birefringence chiral nematic liquid crystals. We investigate the properties and stability of obtained nematicons. We found that reorientational spatial solitons require larger excitation powers in low-birefringence chiral nematics than in high-birefringence but remain more stable and self-focused.

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