scholarly journals Photoaligning and Photopatterning: New LC Technology

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 323 ◽  
Author(s):  
Vladimir Chigrinov ◽  
Jiatong Sun ◽  
Xiaoqian Wang
Keyword(s):  
Liquid Crystal ◽  
Communication Systems ◽  
Rotational Diffusion ◽  
Fresnel Lens ◽  
Image Sensor ◽  
Optical Elements ◽  
Optical Attenuators ◽  
Photo Alignment ◽  
Variable Optical Attenuators ◽  
Photonics Devices

We demonstrate a physical model of photoalignment and photopatterning based on rotational diffusion in solid azo-dye nanolayers. We also highlight the new applications of photoalignment and photopatterning in display and photonics such as: (i) liquid crystal (LC) E-paper devices, including optically rewritable LC E-paper on flexible substrates as 3D E-paper, as well as optically rewritable technology for photonics devices; (ii) photonics LC devices, such as LC Switches, polarization controllers and polarization rotators, variable optical attenuators, LC filled photonic crystal fiber, switchable diffraction grating; (iii) patterned micro-polarizer array using photo-alignment technology for image sensor; (iv) electrically tunable liquid crystal q-plates; (v) electrically switchable liquid crystal Fresnel lens; (vi) liquid crystal optical elements with integrated Pancharatnam-Berry phases. We are sure, that in the field of (LC), the main point is no longer display research, but new photonic applications of LC are emerging in telecommunication, fiber optical communication systems, sensors, switchable lenses, LC light converters and other LC photonics devices.

Arbitrary patterned anisotropic diffractive optical elements using the galvanometer polarization drawing method: application in fabricating polarization-dependent liquid-crystal Fresnel lens cells

2017 ◽  
Vol 56 (5) ◽  
pp. 1302 ◽  
Author(s):  
Kohei Noda ◽  
Jou Matsubara ◽  
Kotaro Kawai ◽  
Moritsugu Sakamoto ◽  
Tomoyuki Sasaki ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Fresnel Lens ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
Lens Cells ◽  
Drawing Method

Liquid crystal variable optical attenuators integrated on planar lightwave circuits

2001 ◽  
Vol 13 (6) ◽  
pp. 609-611 ◽  
Author(s):  
K. Hirabayashi ◽  
M. Wada ◽  
C. Amano
Keyword(s):  
Liquid Crystal ◽  
Planar Lightwave Circuits ◽  
Optical Attenuators ◽  
Variable Optical Attenuators ◽  
Planar Lightwave

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 Electrically Tunable Fresnel Lens in Twisted-Nematic Liquid Crystals Fabricated by a Sagnac Interferometer

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1448 ◽  
Author(s):  
Bing-Yau Huang ◽  
Tsung-Hsien Lin ◽  
Tian-Yi Jhuang ◽  
Chie-Tong Kuo
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Azo Dye ◽  
Focal Length ◽  
Fresnel Lens ◽  
Sagnac Interferometer ◽  
Alignment Effect ◽  
Twisted Nematic ◽  
Linearly Polarized ◽  
Photo Alignment

This paper presents an electrically tunable Fresnel lens in a twisted nematic liquid crystal cell fabricated by using a Sagnac interferometer. When the Fresnel-patterned green beam, formed by the Sagnac interferometer, is irradiated on the azo-dye doped liquid crystal mixture, the azo-dye molecules undergo trans–cis photoisomerization and then generate the photo-alignment effect in the bright (odd) zones. The director of the liquid crystal molecules in the odd zones reorients the direction perpendicular to the polarization direction of the linearly polarized green beam. The various structures of liquid crystals in the odd and even zones will result in a phase difference and thus, a Fresnel lens can be generated. The experimental results show that the proposed Fresnel lens has a high diffraction efficiency of 31.5% under an applied alternating-currents (AC) voltage. The focal length of the Fresnel lens can also be tuned by thermally erasing the photo-alignment effect of the azo dyes and rewriting by a different Fresnel-like pattern.

Sheared polymer network liquid crystal for fast-response variable optical attenuators

2005 ◽  
Author(s):  
Yung-Hsun Wu ◽  
Yi-Hsin Lin ◽  
Yan-Qing Lu ◽  
Hongwen Ren ◽  
Yun-Hsing Fan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polymer Network ◽  
Fast Response ◽  
Response Variable ◽  
Optical Attenuators ◽  
Variable Optical Attenuators

Novel Liquid Crystal Display mode “UV2AⅡ” with Photo Alignment Technology for a Large-Screen 8K Display

2019 ◽  
pp. 257
Author(s):  
Shinichi Terashita ◽  
Kouichi Watanabe ◽  
Fumikazu Shimoshikiryoh
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Large Screen ◽  
Display Mode ◽  
Photo Alignment

Transistor Characteristics of Single Crystalline C8-BTBT Grown in Coated Liquid Crystal Solution on Photo-Alignment Films

2018 ◽  
Vol E101.C (11) ◽  
pp. 884-887
Author(s):  
Risa TAKEDA ◽  
Yosei SHIBATA ◽  
Takahiro ISHINABE ◽  
Hideo FUJIKAKE
Keyword(s):  
Liquid Crystal ◽  
Single Crystalline ◽  
Photo Alignment

44-3: Nanoscopic Patterned Photo-alignment for Electrically Switchable Liquid Crystal Pancharatnam-Berry Phase Diffractive Lens

2016 ◽  
Vol 47 (1) ◽  
pp. 599-601 ◽  
Author(s):  
Alwin Ming Wai Tam ◽  
Fan Fan ◽  
Hung-Shan Chen ◽  
Tao Du ◽  
Vladimir G. Chigrinov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Berry Phase ◽  
Diffractive Lens ◽  
Photo Alignment
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