Alignment Technologies and Applications of Liquid Crystal Devices. Liquid Crystals Book Series, Volume 5. By Kohki Takatoh, Masanori Sakamoto, Ray Hasegawa, Mitsushiro Koden, Nobuyuki Itoh and Masaki Hasegawa.

ChemPhysChem ◽  
2006 ◽  
Vol 7 (8) ◽  
pp. 1826-1827
Author(s):  
Ingo Dierking
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Book Series ◽  
Liquid Crystal Devices

scholarly journals Liquid Crystal Devices for Beam Steering Applications

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 247
Author(s):  
Rowan Morris ◽  
Cliff Jones ◽  
Mamatha Nagaraj
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Adaptive Optics ◽  
Beam Steering ◽  
Optical Components ◽  
Advantages And Disadvantages ◽  
Liquid Crystal Devices

Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented. The paper introduces the properties of liquid crystals that have made them useful in this field followed by a more detailed discussion of specific liquid crystal devices that act as switchable optical components of refractive and diffractive types. The relative advantages and disadvantages of the different devices and techniques are summarised.

scholarly journals Ion-Generating and Ion-Capturing Nanomaterials in Liquid Crystals

Proceedings ◽  
2018 ◽  
Vol 2 (14) ◽  
pp. 1122
Author(s):  
Yuriy Garbovskiy
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Fields ◽  
Future Research ◽  
Research Directions ◽  
Liquid Crystal Devices ◽  
Proposed Model ◽  
Future Research Directions ◽  
Practical Implications ◽  
Good Agreement

The majority of tunable liquid crystal devices are driven by electric fields. The performance of such devices can be altered by the presence of small amounts of ions in liquid crystals. Therefore, the understanding of possible sources of ions in liquid crystal materials is very critical to a broad range of existing and future applications employing liquid crystals. Recently, nanomaterials in liquid crystals have emerged as a hot research topic, promising for its implementation in the design of wearable and tunable liquid crystal devices. An analysis of published results revealed that nanodopants in liquid crystals can act as either ion-capturing agents or ion-generating objects. In this presentation, a recently developed model of contaminated nanomaterials is analyzed. Nanoparticle-enabled ion capturing and ion generation regimes in liquid crystals are discussed within the framework of the proposed model. This model is in very good agreement with existing experimental results. Practical implications and future research directions are also discussed.

scholarly journals Spontaneous helielectric nematic liquid crystals: Electric analog to helimagnets

2021 ◽  
Vol 118 (42) ◽  
pp. e2111101118
Author(s):  
Xiuhu Zhao ◽  
Junchen Zhou ◽  
Jinxing Li ◽  
Junichi Kougo ◽  
Zhe Wan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Nonlinear Optical ◽  
Room Temperature ◽  
Nematic Liquid Crystals ◽  
Polar Liquid ◽  
Experimental Proof ◽  
Liquid Crystal Devices ◽  
Optical Responses ◽  
Electric Analog

Recently, a type of ferroelectric nematic fluid has been discovered in liquid crystals in which the molecular polar nature at molecule level is amplified to macroscopic scales through a ferroelectric packing of rod-shaped molecules. Here, we report on the experimental proof of a polar chiral liquid matter state, dubbed helielectric nematic, stabilized by the local polar ordering coupled to the chiral helicity. This helielectric structure carries the polar vector rotating helically, analogous to the magnetic counterpart of helimagnet. The helielectric state can be retained down to room temperature and demonstrates gigantic dielectric and nonlinear optical responses. This matter state opens a new chapter for developing the diverse polar liquid crystal devices.

Switching of liquid-crystal devices between reflective and transmissive modes using long-pitch cholesteric liquid crystals

2010 ◽  
Vol 35 (20) ◽  
pp. 3504 ◽  
Author(s):  
Ki-Han Kim ◽  
Hye-Jung Jin ◽  
Dong Han Song ◽  
Byoung-Ho Cheong ◽  
Hwan-Young Choi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Cholesteric Liquid Crystals ◽  
Liquid Crystal Devices

scholarly journals Photo-Aligned Ferroelectric Liquid Crystal Devices with Novel Electro-Optic Characteristics

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 563
Author(s):  
Vladimir Chigrinov ◽  
Qi Guo ◽  
Aleksey Kudreyko
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Berry Phase ◽  
Photonic Devices ◽  
Ferroelectric Liquid Crystal ◽  
Optical Elements ◽  
Ferroelectric Liquid Crystals ◽  
Liquid Crystal Devices ◽  
Alignment Technique ◽  
Photo Alignment

This paper examines different applications of ferroelectric liquid crystal devices based on photo-alignment. Successful application of the photo-alignment technique is considered to be a critical breakthrough. A variety of display and photonic devices with azo dye aligned ferroelectric liquid crystals is presented: smart glasses, liquid crystal Pancharatnam–Berry phase optical elements, 2D/3D switchable lenses, and laser therapy devices. Comparison of electro-optical behavior of ferroelectric liquid crystals is described considering the performance of devices. This paper facilitates the optimization of device design, and broadens the possible applications in the display and photonic area.

scholarly journals Organic liquid-crystal devices based on ionic conductors

2017 ◽  
Vol 4 (6) ◽  
pp. 1102-1109 ◽  
Author(s):  
Can Hui Yang ◽  
Shuang Zhou ◽  
Samuel Shian ◽  
David R. Clarke ◽  
Zhigang Suo
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Organic Liquid ◽  
Device Performance ◽  
Ionic Conductors ◽  
Liquid Crystal Devices

We use hydrogels to drive liquid crystals, achieving stretchable electrooptics. The device performance was maintained under a biaxial stretch of 1.5.

scholarly journals Tunable scattering from liquid crystal devices using carbon nanotubes network electrodes

Nanoscale ◽  
2015 ◽  
Vol 7 (1) ◽  
pp. 330-336 ◽  
Author(s):  
Ammar A. Khan ◽  
G. Dinesha M. R. Dabera ◽  
Haider Butt ◽  
Malik M. Qasim ◽  
Gehan A. J. Amaratunga ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Optoelectronic Devices ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Liquid Crystal Devices ◽  
Rare Combination ◽  
Walled Carbon Nanotubes

We demonstrate a rare combination of polymer wrapped single walled carbon nanotubes with liquid crystals to produce switchable optoelectronic devices.

Conformal mapping techniques for the modelling of liquid crystal devices

2011 ◽  
Vol 23 (1) ◽  
pp. 99-119 ◽  
Author(s):  
A. J. DAVIDSON ◽  
N. J. MOTTRAM
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Numerical Methods ◽  
Conformal Mapping ◽  
Stable State ◽  
Stable States ◽  
Confined Geometries ◽  
Liquid Crystal Devices ◽  
Mapping Techniques ◽  
Switching Characteristics

In this paper, we review a number of uses of conformal mapping techniques for obtaining director profiles of liquid crystals in confined and semi-confined geometries. In particular, we will consider geometries which allow more than one stable state, some of which are of use in bistable displays. These solutions also allow the investigation of the energy of stable states and enable conclusions to be reached as to how such geometries may be optimised for bistable display applications. Such techniques are also able to provide initial configurations for the solution of more complicated situations where numerical methods are used to investigate switching characteristics.

scholarly journals Overlooked Ionic Phenomena Affecting the Electrical Conductivity of Liquid Crystals

2021 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
David Webb ◽  
Yuriy Garbovskiy
Keyword(s):  
Electrical Conductivity ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Physical Properties ◽  
Soft Matter ◽  
Photonic Devices ◽  
Optical Components ◽  
Dynamically Reconfigurable ◽  
Liquid Crystal Devices ◽  
New Applications

Liquid crystal devices, such as displays, various tunable optical components, and sensors, are becoming increasingly ubiquitous. Basic physical properties of liquid crystal materials can be controlled by external physical fields, thus making liquid crystal devices dynamically reconfigurable. The tunability of liquid crystals offers exciting opportunities for the development of new applications, including advanced electronic and photonic devices, by merging the concepts of flat optics, tunable metasurfaces, nanoplasmonics, and soft matter biophotonics. As a rule, the tunability of liquid crystals is achieved by applying an electric field. This field reorients liquid crystals and changes their physical properties. Ions, typically present in liquid crystals in minute quantities, can alter the reorientation of liquid crystals through the well-known screening effect. Because the electrical conductivity of thermotropic liquid crystals is normally caused by ions, an understanding of ion generation processes in liquid crystals is of utmost importance to existing and emerging technologies relying on such materials. That is why measuring of electrical conductivity of liquid crystals is a standard part of their material characterization. Measuring the electrical conductivity of liquid crystals is a very delicate process. In this paper, we discuss overlooked ionic phenomena caused by interactions of ions with substrates of the liquid crystal cells. These interactions affect the measured values of the DC electrical conductivity of liquid crystals and make them dependent on the cell thickness.

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