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Micro-patterned liquid crystal Pancharatnam-Berry axilens

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Chinese Optics Letters 2018年第6期16卷 78-82页

作者： Jiarui Ren Weichang.Wang.Weiqiang.Vang.Cong.ong.Yuan Kang.Zhou Xiao Li g.win Ming.ai Tam Culling.Meng.Jiatong.Sun vladimir g. chigrinov Hoising.Kwok Xiaoqian Wang.Zhig.ng.Zheng.Dong.Shen Physics Department East China University of Science and Technology Shanghai 200237 China ECE Department Hong IKong University of Science and Technology Hong IKong 999077 China Colleg. of Information Science and Technolog. Donghua University Shanghai 201620 China

A liquid crystal Pancharatnam–Berry（PB） axilens is proposed and fabricated via a dig.tal micro-mirrordevice-based photo-patterning.system. The polarization-dependent device behaves as an axilens for a lefthanded circularly polarized incident beam, for which an optical ring.is focused with a long.focal depth in the transverse direction at the output, and an anti-axilens for a rig.t-handed circularly polarized incident beam,for which an optical ring.g.adually expands at the output. The modification of the size and the sharpness of the diffracted ring.beam is demonstrated by encoding.a positive（neg.tive） PB lens term into the director expression of a PB（anti-）axicon.

关键词： Micro-patterned liquid crystal Pancharatnam-Berry axilens

Liquid crystal applications in photonics

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Frontiers of Optoelectronics 2010年第1期3卷 103-107页

作者： vladimir g.chigrinov Department of Electronic and Computer Eng.neering Hong Kong University of Science and Technology

We developed new optical switches based on nematic and ferroelectric liquid crystal(LC) cells for photonics applications. Certain new LC switches based on the effect of total internal reflection in nematic LC and deformed helix ferroelectric effect ferroelectric LC with very fast response time were developed. Fast bistable optical switches of the lig.t polarization based on ferroelectric liquid crystal cells were proposed. The switches are characterized by 100 μs switching.time and 26 dB crosstalk at the waveleng.h of 632.8 nm and bistable, i.e., required zero power consumption in the switch *** frequency hysteretic free electrically controlled 0–2π phase modulation of lig.t has been proposed using.a very short helix pitch(less than 400 nm) deformed helix ferroelectric liquid crystal. The electrically controlled 0–2π hysteretic free phase modulation was achieved at the driving.voltag. frequency up to 4 kHz and the voltag. amplitude of 32 V. The application of fast V-shaped deformed helix ferroelectric ferroelectric LC(DHF-FLC)for new active-matrix liquid crystal display(LCD) and optical data processing.devices is *** technolog. can be very useful for the new g.neration of liquid crystal devices as well as in new photovoltaic, optoelectronic and photonic devices based on hig.ly ordered thin org.nic layers. We have investig.ted the LC photoalig.ment in superthin tubes, which are basic elements of switchable photonic crystal/liquid crystal structures and obtained the order parameter comparable with usual homog.neous nematic LC cells. We studied LC alig.ment on silicon surfaces with submicrometer-sized straig.t and curved waveg.ide profiles. The liquid crystal cladding.refractive index was then varied according.to the applied voltag., and subsequently the microresonator resonance waveleng.hs were tuned. Based on our initial measurements, the free spectral rang.(FSR) waveleng.h shift within the rang. of 20 nm was obtained, which is comparable

关键词： liquid crystals fiber optical devices switches photoalig.ment optically rewritable waveg.ide

Kerr effect and Kerr constant enhancement in vertically alig.ed deformed helix ferroelectric liquid crystals

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Chinese Physics B 2016年第9期25卷 9-12页

作者： Liang.u Shi Abhishek Kumar Srivastava vladimir g.chigrinov Hoi-Sing.Kwok State Key Laboratory on Advanced Displays and Optoelectronics Technolog.es Hong Kong University of Science and Technology

In this article,we review recently achieved Kerr effect prog.ess in novel liquid crystal（LC） material：vertically alig.ed deformed helix ferroelectric liquid crystal（VADHFLC）.With an increasing.applied electric field,the induced inplane birefring.nce of LCs shows quadratic *** theoretical calculations and experimental details are *** an enhanced Kerr constant to 130 nm/V2,this VADHFLC cell can achieve a 2π modulation by a small efficient electric field with a fast response around 100 μs and thus can be employed in both display and photonics devices.

关键词： Kerr effect deformed helix ferroelectric liquid crystal phase modulation of lig.t

Increasing.the rewriting.speed of optical rewritable e-paper by selecting.proper liquid crystals

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Chinese Physics B 2012年第8期21卷 121-125页

作者：耿煜孙嘉瞳 Anatoli Murauski vladimir chigrinov 郭海成 Center for Display Research Department of Electrical and Electronic EngineeringHong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Department of Electrical and Electronic Eng.neering Hong Kong University of Science and TechnologyClear Water Bay KowloonHong KongChina

The effect of interaction between liquid crystal （LC） and photoalig.ment material on the speed of optical rewriting.process is investig.ted. The theoretical analysis shows that a smaller frank elastic constant K22 of liquid crystal corresponds to a larg.r twist ang.e, which g.ves rise to a larg.r rewriting.speed. Six different LC cells with the same boundary conditions （one substrate is covered with rubbed polyimide （PI） and the other with photo sensitive rewritable sulfuric dye I（SD1）） are tested experimentally under the same illumination intensity （450 nm, 80 mW/cm2）. The results demonstrate that with a suitable liquid crystal, the LC optical rewriting.speed for e-paper application can be obviously improved. For two well known LC materials E7 （K22 is larg.r） and 5CB （K22 is smaller）, they require 11 s and 6 s corresponding.to chang. alig.ment direction for g.nerating.imag. information.

关键词： azo-dye optical rewritable photoalig.ment rewriting.speed

Liquid crystal Fresnel lens display

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Chinese Physics B 2016年第9期25卷 88-90页

作者：王骁乾 Srivastava Abhishek Kumar 谈明威郑致刚沈冬 chigrinov g.vladimir 郭海成 Physics Department East China University of Science and Technology State Key Laboratory on Advanced Displays and Optoelectronics Technolog.es HKUST

A novel see-throug. display with a liquid crystal lens array was proposed.A liquid crystal Fresnel lens display（LCFLD） with a holog.aphic screen was *** proposed display system has hig. efficiency,simple fabrication... 详细信息

关键词： see-throug. display liquid crystal Fresnel lens array holog.aphic screen

Novel Transflective LCD Based on Patterned Polarizer Using.Photoalig.ment Technique

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Novel Transflective LCD Based on Patterned Polarizer Using P...

Method of Formation of Waveg.ides on the Basis of Any Polymeric Materials

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作者： H.Y.Mak Alexander Muravsky vladimir chigrinov Hoi Sing.Kwok Center for Display Research Department of Electronic and Computer Eng.neering.Hong.Kong.University of Science and Technolog. Clear Water BayKowloonHong KongChina Center for Display Research Department of Electronic and Computer Eng.neering.Hong.Kong.University of Science and Technolog. Clear Water BayKowloonHong KongChina Center for Display Research Department of Electronic and Computer Eng.neering.Hong.Kong.University of Science and Technolog. Clear Water BayKowloonHong KongChina Center for Display Research Department of Electronic and Computer Eng.neering.Hong.Kong.University of Science and Technolog. Clear Water BayKowloonHong KongChina

＜正＞A new transflective liquid crystal display （LCD） based on patterned polarizer using.photoalig.ment technique has been *** consists of two optical modes:optically compensated bend （OCB） and low twist nematic modes,which have the same cell *** no double cell g.p structure is included in the config.ration,the fabrication process could be sim- pler compared with conventional double cell g.p transflective *** the help of photoalig.ment technique,patterned polarizer could be obtained and domains for OCB mode and low twist nematic mode could be *** on this new config.ration,a transflective LCD with hig. brig.tness and hig. contrast could be achieved.

关键词： Transflective Display Sing.e Cell g.p Photoalig.ment OCB Twist Nematic

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World Journal of Nano Science and Eng.neering 2015年第4期5卷 213-218页

作者： Valentin Tsvetkov Serg.i Pasechnik Aleksei Dronov Jacob Y. L. Ho vladimir chigrinov Hoi-Sei Kwok Problem Laboratory of Molecular Acoustics Moscow State University of Instrument Engineering and Computer Sciences Moscow Russia National Research University of Electronic Technolog. Moscow Zelenograd Russia State Key Laboratory on Advanced Displays and Optoelectronics Technolog.es Clear Water Bay Kowloon Hong Kong China

This paper describes a new type of polymeric waveg.ides which has the core, cladding.medium and active nodes made from the same material. Part of the polymer is removed in cladding.medium by formation of nanopores. The pores can be filled with liquid crystals (LC) in order to create an active composite medium needed for electrically controlled nodes formation.

关键词： Polymeric Materials Nanopores Waveg.ides Optical

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用于液晶盒偶氮染料光致取向层的合成和性质

现代显示 2003年第4期 26-32页

作者：郭海成 vladimir chigrinov Elena Prudnikova vladimir Kozenkov Hidenari Akiyama Tatsuo Kawara Hirokazu Takada Haruyoshi Takatsu 香港科技大学大日本油墨化学工业公司

我们研究了可用于光致取向液晶(LCs)偶氮染料的合成和性质,提出了偶氮染料的结构与合成过程。偶氮染料光致取向完全是因为分子吸收振子垂直于UV光偏振方向的再取向。讨论了在偏振光场中,偶氮染料分子旋转扩散现象的定性模型。测量了波长... 详细信息

我们研究了可用于光致取向液晶(LCs)偶氮染料的合成和性质,提出了偶氮染料的结构与合成过程。偶氮染料光致取向完全是因为分子吸收振子垂直于UV光偏振方向的再取向。讨论了在偏振光场中,偶氮染料分子旋转扩散现象的定性模型。测量了波长为372nm时,偏振吸收光谱的有序参数S=-0.4(80%的最大绝对值Sm=-0.5)。对一个偶氮染料膜,利用在正常的正入射偏振光之后,紧跟一个斜入射的非偏振光两步曝光,可以获得温度稳定的5.3°预倾角。光致取向基片的方位角锚定能为Aφ≈10-4Jm-2,这与摩擦聚酰亚胺(PI)层的锚定能相同。我们发现,光致取向液晶盒的电压保持率甚至比摩擦PI层取向的还高,因此,偶氮染料完全可以用作有源矩阵液晶显示器的取向层。光致取向偶氮染料层的热稳定性很高,但UV稳定性需通过诸如聚合等来改良。于是,我们设想了一种新的基于聚合偶氮染料层的LCD取向技术。

关键词：光致取向液晶盒偶氮染料光致取向偏振光场聚合偶氦染料层

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液晶显示器的优化与模型试验

现代显示 2004年第5期 43-45页

作者： vladimir chigrinov Dmitry Yakovlev 郭海成公伟刚宋行宾周立祁技超香港科技大学电子与电子工程系京东方光电科技有限公司

利用专门软件对LCD进行模型试验和优化是一项普遍采用的技术,并且是开发现代LCD结构和了解其工作机理的强有力工具。

关键词： LCD 液晶显示器工作机理软件优化工具开发发现