scholarly journals Electrical Behavior of Liquid Crystal Devices with Dielectric Nanoparticles

2020 ◽  
Vol 2020 ◽  
pp. 1-7 ◽  
Author(s):  
Vicente Marzal ◽  
Manuel Caño-García ◽  
Juan Carlos Torres ◽  
Xabier Quintana ◽  
Isabel Pérez ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Liquid Crystal ◽  
Effective Properties ◽  
Electronic Devices ◽  
Liquid Crystal Cell ◽  
Electrical Behavior ◽  
Spectroscopy Technique ◽  
Liquid Crystal Devices ◽  
Impedance Spectroscopy Technique ◽  
Cell Capacitance

Nowadays, the development of new devices based on liquid crystal (LC) materials requires improved tuning characteristics according to the application. One approach for this improvement is the use of nanomaterials with the capability of modifying the effective properties of the doped LC mixture. In this work, we analyze the electrical behavior of a titanium dioxide (TiO2) nanoparticle-doped liquid crystal cell using an equivalent circuit. The circuit parameters have been obtained using the impedance spectroscopy technique and time response measurements. The particularity of the samples designed is that the nanoparticles are not dispersed in the LC. Instead of that, nanoparticles are randomly deposited on one of the electrodes. Measurements show that the presence of the nanoparticles increases the temperature sensitivity of the equivalent cell capacitance and the capacitance difference between switched and nonswitched states. These results could be quite useful in the design of novel liquid crystal electronic devices and sensors.

scholarly journals Electrical Parameters of Different Concentrations of Methyl Red in Fullerene Doped Liquid Crystal

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
M. Okutan ◽  
O. Köysal ◽  
S. E. San ◽  
Y. Köysal
Keyword(s):  
Relaxation Time ◽  
Liquid Crystal ◽  
Dielectric Permittivity ◽  
Critical Frequency ◽  
Dielectric Anisotropy ◽  
Methyl Red ◽  
Spectroscopy Technique ◽  
Electrical Parameters ◽  
Impedance Spectroscopy Technique ◽  
Doping Ratio

Dielectric anisotropy and relaxation time of a liquid crystal (LC) system, containing fullerene and methyl red (MR) dye, were studied via impedance spectroscopy technique under a bias voltage. Dye concentration is tried to be 0.1%, 0.5%, and 1% in host nematic liquid crystal coded E7. Dielectric permittivity and dielectric anisotropy values of the samples were investigated between the frequency ranges of 100–10 MHz. It is seen that dielectric anisotropy is strongly affected by doping ratio and this value decreases with increasing dye. Also, relaxation time τ and critical frequency values were calculated depending on voltage of different dye ratios.

scholarly journals Electro-optical characteristics of a liquid crystal cell with graphene electrodes

2017 ◽  
Vol 8 ◽  
pp. 2802-2806 ◽  
Author(s):  
Nune H Hakobyan ◽  
Hakob L Margaryan ◽  
Valeri K Abrahamyan ◽  
Vladimir M Aroutiounian ◽  
Arpi S Dilanchian Gharghani ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Communication ◽  
Indium Tin Oxide ◽  
Liquid Crystal Cell ◽  
Liquid Crystal Devices ◽  
Transparent Conducting ◽  
Chemical Inertness ◽  
Excellent Candidate ◽  
Orientation Boundary ◽  
Ito Films

In liquid crystal devices (LCDs) the indium tin oxide (ITO) films are traditionally used as transparent and conductive electrodes. However, today, due to the development of multichannel optical communication, the need for flexible LCDs and multilayer structures has grown. For this application ITO films cannot be used in principle. For this problem, graphene (an ultrathin material with unique properties, e.g., high optical transparency, chemical inertness, excellent conductivity) is an excellent candidate. In this work, the electro-optical and dynamic characteristics of a liquid crystal (LC) cell with graphene and ITO transparent conducting layers are investigated. To insure uniform thickness of the LC layer, as well as the same orientation boundary conditions, a hybrid LC cell containing graphene and ITO conductive layers has been prepared. The characteristics of LC cells with both types of conducting layers were found to be similar, indicating that graphene can be successfully used as a transparent conductive layer in LC 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.

Dichroic Azo Dyes for Guest-Host Liquid-Crystal Cell

1982 ◽  
Vol 21 (Part 1, No. 1) ◽  
pp. 191-192 ◽  
Author(s):  
Hidehiro Seki ◽  
Chiyoko Shishido ◽  
Shigeo Yasui ◽  
Tatsuo Uchida
Keyword(s):  
Liquid Crystal ◽  
Azo Dyes ◽  
Liquid Crystal Cell ◽  
Crystal Cell
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