Bragg Reflection of Linearly Polarized Light in a Chiral Smectic C Liquid Crystal for Oblique Incidence

1984 ◽  
Vol 102 (6-7) ◽  
pp. 187-192 ◽  
Author(s):  
S. N. Aronishidze ◽  
G. S. Chilaya ◽  
M. N. Kushnirenko ◽  
S. M. Osadchii
Keyword(s):  
Liquid Crystal ◽  
Oblique Incidence ◽  
Bragg Reflection ◽  
Polarized Light ◽  
Smectic C ◽  
Linearly Polarized

Oriental behaviour of some homologues of 4-n-pentyl-phenylthio-4′-n-alkoxybenzoate doped with dichroic dye

2008 ◽  
Vol 16 (3) ◽  
Author(s):  
D. Bauman ◽  
A. Zięba ◽  
E. Mykowska
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Liquid Crystalline ◽  
Orientational Order ◽  
Polarized Light ◽  
Emission Spectra ◽  
Smectic C ◽  
Fluorescence Measurements ◽  
Dichroic Dye ◽  
Linearly Polarized

AbstractThe long-range orientational order of three members of 4-n-pentylphenylthio-4′-n-alkoxybenzoate $$ (\bar nS5) $$ series doped with a dichroic dye was studied by means of electronic absorption and fluorescence measurements. The order parameters <P2> and <P4> as well as the orientational distribution function were determined on the basis of absorption and emission spectra of linearly polarized light recorded as a function of temperature in the nematic, smectic A, and smectic C phases. An influence of the dye molecular structure on the orientational order of the dye/liquid crystal mixture was observed. Moreover, the dependence of the order parameter values on the length of the alkoxy chain in liquid crystal molecules was found. It was shown that the order parameter <P4>, obtained from fluorescence measurements, can be helpful in recognizing the second-order or weakly first-order transitions between various liquid crystalline phases.

Generation of nematic liquid crystal alignment with polyimides exposed to linearly polarized light of long wavelength

1998 ◽  
Vol 84 (1) ◽  
pp. 181-188 ◽  
Author(s):  
Yinghan Wang ◽  
Chunying Xu ◽  
Akihiko Kanazawa ◽  
Takeshi Shiono ◽  
Tomiki Ikeda ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Polarized Light ◽  
Long Wavelength ◽  
Liquid Crystal Alignment ◽  
Linearly Polarized ◽  
Crystal Alignment

Bistable Characteristics of Liquid Crystal Devices with Patterned Alignment Films

2011 ◽  
Vol 264-265 ◽  
pp. 1752-1757 ◽  
Author(s):  
Jais Bin Lias ◽  
Munehiro Kimura ◽  
Tadashi Akahane
Keyword(s):  
Liquid Crystal ◽  
Uv Light ◽  
Polarized Light ◽  
Mechanical Damage ◽  
Single Step ◽  
Patterned Substrate ◽  
Electrostatic Charges ◽  
Linearly Polarized ◽  
Polyimide Coating ◽  
Homeotropic Alignment

The photoalignment technology for the alignment of liquid crystal molecules has lately gathered much attention because its advantages over the conventional rubbing of polyimide coating and several different approaches for the realization of photoalignment have been presented. Due to its non-contact nature, a photoalignment eliminates generation of dust and electrostatic charges as well as mechanical damage to the surface. Up to now, the study of the photoalignment effect has been focused mostly on uniform substrates through linearly polarized light. With the aim to achieve such a bistable liquid crystal device by means of unpolarized UV light, we have proposed a single-step laser patterning on a photoalignment layer using a photomask to achieve an equilibrium configuration of LC molecules in contact with a periodically patterned substrate. The patterns were formed by stripes of alternating random planar and homeotropic anchoring in a sub-micron scale on the order of 0.5 micron. We proposed two possible configurations of bistable LC cells that can be obtained by combination of micro-patterned surface formed with alternating random planar alignment with either planar alignment or homeotropic alignment surfaces. In this study, we have investigated the alignment properties and switching behaviours of both proposed models.

ON THE BEHAVIOR OF POLARIZED LIGHT IN TWIST-ORIENTED NEMATIC LIQUID CRYSTALS WITH ANISOTROPIC ABSORBENT DYE

2020 ◽  
Vol 54 (1 (251)) ◽  
pp. 56-60
Author(s):  
H.H. Hovakimyan
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nematic Liquid Crystal ◽  
Azimuthal Angle ◽  
Polarized Light ◽  
Transmitted Light ◽  
Propagation Of Light ◽  
Linearly Polarized ◽  
Incoming Light

In this work we study the propagation of light in a twist-oriented pleochroic nematic liquid crystal with pleochroic dye. The dependence of the intensity of transmitted light on the azimuthal angle of the linearly polarized incoming light has been investigated experimentally. As a result, the role of absorption anisotropy has been identified.

scholarly journals Reflection Band Control of Inverse Opal Film with Photoresponse Properties of Push-Pull Type Azobenzene LC Polymers

2008 ◽  
Vol 2008 ◽  
pp. 1-5
Author(s):  
Sunnam Kim ◽  
Takahiro Shiozawa ◽  
Masaki Moritsugu ◽  
Tomonari Ogata ◽  
Takamasa Nonaka ◽  
...  
Keyword(s):  
Bragg Reflection ◽  
Polymer System ◽  
Polarized Light ◽  
Wavelength Region ◽  
Inverse Opal ◽  
Reflection Band ◽  
Linearly Polarized ◽  
Photo Response ◽  
The Relationship ◽  
Azobenzene Groups

DcAz2Mc and DR1Mc molecules having push-pull type of azobenzene groups are synthesized, and their photo-orientational behaviors are investigated in the polymer system. In order to understand the relationship between a molecular structure and its physical properties, electronic structure calculation is computationally carried out. Regarding to their photo response properties, the copolymers ofpoly(DcAz2Mc-co-M6PBMe) andpoly(DR1Mc-co-M6PBMe) are infiltrated into inverse opal films, and Bragg reflection shifts are observed under photostimuli. When the linearly polarized light is irradiated, Bragg reflection bands are shifted to the longer wavelength region as reflective index increases.

scholarly journals High-Reflective Templated Cholesteric Liquid Crystal Filters

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6889
Author(s):  
Yao Gao ◽  
Yuxiang Luo ◽  
Jiangang Lu
Keyword(s):  
Liquid Crystal ◽  
Bragg Reflection ◽  
Cholesteric Liquid Crystal ◽  
Polarized Light ◽  
Single Layer ◽  
Helical Structure ◽  
Optical Filters ◽  
Blue Color ◽  
Phase Liquid ◽  
Multi Phase

Cholesteric liquid crystals (CLCs) have been widely applied in optical filters due to Bragg reflection caused by their helical structure. However, the reflectivity of CLC filters is relatively low, commonly less than 50%, as the filters can only reflect light polarized circularly either left- or right-handedly. Therefore, a high-reflective CLC filter with a single-layer template was proposed which may reflect both right- and left-handed polarized light. The CLC filters of the red, green, blue color were fabricated by the templating technology, which show good wavelength consistency. Additionally, a multi-phase liquid crystal filter with high reflectance was demonstrated by the single-layer templating technology. The templated CLC or multi-phase liquid crystal filters show great potential applications in the optical community, reflective display, and lasing.

scholarly journals Геометрическая оптика твист-ориентированного нематического жидкого кристалла с анизотропным поглощением

2019 ◽  
Vol 127 (11) ◽  
pp. 787
Author(s):  
А.О. Овакимян ◽  
А.Э. Айвазян ◽  
Л.С. Асланян
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Anisotropic Medium ◽  
Light Propagation ◽  
Light Wave ◽  
Spatial Dynamics ◽  
Polarized Light ◽  
Asymmetric Effect ◽  
Electric Component ◽  
Linearly Polarized

The spatial dynamics of polarized light in a smoothly inhomogeneous anisotropic medium mixed with an anisotropic absorbing dye is analyzed. As such a medium, a twist-oriented nematic liquid crystal with a pleochroic dye was considered. In the geometrical-optical approximation, a system of coupled shortened equations for the Cartesian components of the electric component of the light wave is obtained. A system of coupled complex equations was analytically solved and the behavior of a linearly polarized wave in such a medium was analyzed in the case of both absorption and amplification. An asymmetric effect of these two processes on the spatial dynamics of light propagation in the medium is found.

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