A dead-zone free 4He atomic magnetometer with intensity-modulated linearly polarized light and a liquid crystal polarization rotator

2015 ◽  
Vol 86 (10) ◽  
pp. 103105 ◽  
Author(s):  
T. Wu ◽  
X. Peng ◽  
Z. Lin ◽  
H. Guo
Keyword(s):  
Liquid Crystal ◽  
Dead Zone ◽  
Polarized Light ◽  
Polarization Rotator ◽  
Intensity Modulated ◽  
Linearly Polarized

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

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

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 A Tunable Graphene 0–90° Polarization Rotator Achieved by Sine Equation Voltage Adjustment

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 849 ◽  
Author(s):  
Jinsong Dai ◽  
Zhongchao Wei ◽  
Lin Zhao ◽  
Qiyuan Lin ◽  
Yuyao Lou
Keyword(s):  
Fermi Level ◽  
Polarized Light ◽  
Light Polarization ◽  
Polarization Angle ◽  
Polarization Rotator ◽  
Terahertz Region ◽  
Linearly Polarized ◽  
Optic Communication ◽  
Radially Polarized ◽  
Sine Equation

Polarization Manipulation has been widely used and plays a key role in wave propagation and information processing. Here, we introduce a polarization rotator in the terahertz range with a polarization conversion ratio up to 99.98% at 4.51 terahertz. It has a single graphene layer on top of the structure patterned by 45° tilted space elliptical rings. By changing the Fermi level from 0.3 ev to 0.7 ev of the graphene, we can turn the reflective light polarization direction between 0° to 90° with nearly unique magnitude. Surface currents theories and graphene characteristics clarify the relationship between polarization angle and Fermi level to be a sine equation adjusted voltage. We firstly put forward an equation to thetunable graphene changing the reflective light polarization angle. It can be widely used in measurement, optic communication, and biology. Besides, with nearly the unique reflective light in different directions, the rotator is designed into a novel radially polarization converter. The latter can be switched from radially polarized light to linearly polarized light, and vice versa, in the terahertz region.

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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