Molecular reorientation of polyimide film induced by thermal nanoimprint lithography and liquid crystals alignment on it

Polymer ◽  
2015 ◽  
Vol 72 ◽  
pp. 113-117 ◽  
Author(s):  
Sudu Siqing ◽  
Hui Wu ◽  
Atsushi Takahara
Keyword(s):  
Liquid Crystals ◽  
Nanoimprint Lithography ◽  
Polyimide Film ◽  
Molecular Reorientation

An in-plane switching liquid crystal cell with weakly anchored liquid crystals on the electrode substrate

2017 ◽  
Vol 5 (18) ◽  
pp. 4384-4387 ◽  
Author(s):  
O. Sato ◽  
N. Iwata ◽  
J. Kawamura ◽  
T. Maeda ◽  
Y. Tsujii ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Liquid Crystal Displays ◽  
Polyimide Film ◽  
Liquid Crystal Cell ◽  
Crystal Cell ◽  
Hexyl Methacrylate ◽  
The One

We present the “one-side zero-anchoring in-plane switching” (OZ-IPS) mode in liquid crystal displays (LCDs) comprising an electrode substrate onto which poly(hexyl methacrylate) chains are grafted and a counter substrate coated with a rubbed polyimide film.

PHOTOINDUCED MOLECULAR REORIENTATION IN POLYMERS, LANGMUIR-BLODGETT FILMSAND LIQUID CRYSTALS

1996 ◽  
Vol 05 (02) ◽  
pp. 165-187 ◽  
Author(s):  
L.M. BLINOV
Keyword(s):  
Liquid Crystals ◽  
Room Temperature ◽  
Optical Recording ◽  
Side Chain ◽  
Molecular Reorientation ◽  
Langmuir Blodgett ◽  
Physical Mechanisms ◽  
Novel Technique ◽  
Liquid Solutions ◽  
Langmuir Blodgett Films

A review of the experimental data on a photoinduced molecular reorientation in various molecular guest-host systems (dyes in liquid solutions, liquid crystals and polymer matrices), side-chain polymers and Langmuir-Blodgett films (LBFs) containing light absorbing chromophores is presented. The photoorientation may be reversible or irreversible. It is accompanied by the photoinduced dichroism and optical anisotropy which is widely used for optical recording information. Special attention is paid to the photoassisted poling of polymers and LBFs, a novel technique that allows for the preparation of the stable photoelectrets at room temperature possessing very promising nonlinear optical properties. The physical mechanisms of the photoinduced molecular reorientation are discussed.

Memory Effects in Nematic Liquid Crystals by a Surface Molecular Reorientation

1991 ◽  
Vol 30 (Part 1, No. 12A) ◽  
pp. 3450-3455 ◽  
Author(s):  
Toshiaki Nose ◽  
Shin Masuda ◽  
Susumu Sato
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Memory Effects ◽  
Molecular Reorientation

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

scholarly journals Light Propagation in Confined Nematic Liquid Crystals and Device Applications

2021 ◽  
Vol 11 (18) ◽  
pp. 8713
Author(s):  
Antonio d’Alessandro ◽  
Rita Asquini
Keyword(s):  
Liquid Crystals ◽  
Optical Switching ◽  
Liquid Crystalline ◽  
Light Propagation ◽  
Soda Lime ◽  
Significant Feature ◽  
Molecular Reorientation ◽  
Crystalline Materials ◽  
Integrated Optic Devices ◽  
Liquid Crystalline Materials

Liquid crystals are interesting linear and nonlinear optical materials used to make a wide variety of devices beyond flat panel displays. Liquid crystalline materials can be used either as core or as cladding of switchable/reconfigurable waveguides with either an electrical or an optical control or both. In this paper, materials and main device structures of liquid crystals confined in different waveguide geometries are presented using different substrate materials, such as silicon, soda lime or borosilicate glass and polydimethylsiloxane. Modelling of the behaviour of liquid crystal nanometric molecular reorientation and related refractive index distribution under both low-frequency electric and intense optical fields is reported considering optical anisotropy of liquid crystals. A few examples of integrated optic devices based on waveguides using liquid crystalline materials as core for optical switching and filtering are reviewed. Reported results indicate that low-power control signals represent a significant feature of photonic devices based on light propagation in liquid crystals, with performance, which are competitive with analogous integrated optic devices based on other materials for optical communications and optical sensing systems.

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