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铁电液晶光电模式及其应用

液晶与显示 2020年第7期35卷 675-684页

作者：郭琦杜芸梦赵慧洁 chigrinov v g 郭海成北京航空航天大学仪器科学与光电工程学院北京100191 香港科技大学先进显示与光电子技术国家重点实验室香港999077

铁电液晶因具有低电压驱动下的微秒级响应,近年来得到科研工作者的广泛关注,且有望应用于下一代显示及光子学器件领域。本文介绍3种典型铁电液晶光电模式,分别为表面稳定型(surface stabilized ferroelectric liquid crystal,SSFLC)、... 详细信息

铁电液晶因具有低电压驱动下的微秒级响应,近年来得到科研工作者的广泛关注,且有望应用于下一代显示及光子学器件领域。本文介绍3种典型铁电液晶光电模式,分别为表面稳定型(surface stabilized ferroelectric liquid crystal,SSFLC)、螺旋形变型(deformed helix ferroelectric,DHF)及电致解旋型(electrically suppressed helix,ESH)。对各光电模式的工作原理及对应的电光效应进行详细阐述,如双稳及多稳态响应、连续灰阶调制、高对比度开关等。同时,光控取向技术在铁电液晶器件中发挥着至关重要的作用。相较于传统摩擦取向层,光控偶氮染料取向层可实现非接触的、锚定能有效控制的铁电液晶取向,这为铁电液晶器件的无缺陷、大面积均匀取向提供前期基础。因此,高对比度、高分辨率、快响应的铁电液晶器件在未来的场序彩色显示、微型显示、2D/3D显示等领域有着广阔应用前景。

关键词：铁电液晶光控取向快响应液晶显示液晶光学器件

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 Engineering 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 light polarization based on ferroelectric liquid crystal cells were proposed. The switches are characterized by 100 μs switching time and 26 dB crosstalk at the wavelength 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 light 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 voltage frequency up to 4 kHz and the voltage 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 *** technology can be very useful for the new generation of liquid crystal devices as well as in new photovoltaic, optoelectronic and photonic devices based on highly ordered thin organic layers. We have investigated the LC photoalignment in superthin tubes, which are basic elements of switchable photonic crystal/liquid crystal structures and obtained the order parameter comparable with usual homogeneous nematic LC cells. We studied LC alignment on silicon surfaces with submicrometer-sized straight and curved waveguide profiles. The liquid crystal cladding refractive index was then varied according to the applied voltage, and subsequently the microresonator resonance wavelengths were tuned. Based on our initial measurements, the free spectral range(FSR) wavelength shift within the range of 20 nm was obtained, which is comparable

关键词： liquid crystals fiber optical devices switches photoalignment optically rewritable waveguide

Kerr effect and Kerr constant enhancement in vertically aligned deformed helix ferroelectric liquid crystals

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Chinese Physics B 2016年第9期25卷 9-12页

作者： Liangyu Shi Abhishek Kumar Srivastava vladimir g chigrinov Hoi-Sing Kwok State Key Laboratory on Advanced Displays and Optoelectronics Technologies Hong Kong University of Science and Technology

In this article,we review recently achieved Kerr effect progress in novel liquid crystal（LC） material：vertically aligned deformed helix ferroelectric liquid crystal（vADHFLC）.With an increasing applied electric field,the induced inplane birefringence 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 light

Ferroelectric liquid crystals for fast switchable circular Dammann grating [Invited]

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Chinese Optics Letters 2020年第8期18卷 2-5页

作者： Qi guo Tian Liu Xiaoqian Wang Zhigang Zheng Aleksey Kudreyko Huijie Zhao v.chigrinov Hoi-Sing Kwok School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China Beihang University Qingdao Research Institute Qingdao 266101China Physics Department East China University of Science and TechnologyShanghai 200237China Department of Medical Physics and Informatics Bashkir State Medical UniversityUfa 450008Russia School of Physics and Optoelectronic Engineering Foshan UniversityFoshan 528000China State Key Laboratory on Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and TechnologyHong Kong 999077China Department of Theoretical Physics Moscow Region State UniversityMytishi 141014Russia

Diffractive optical elements attract a considerable amount of attention, mainly due to their potential applications in imaging coding, optical sensing, etc. Application of ferroelectric liquid crystals(FLCs) with photoalignment technology in diffractive optical elements results in a high efficiency and a fast response time. In this study we demonstrate a circular Dammann grating(CDg) with a diffraction efficiency of 84.5%. The achieved response time of 64 μs is approximately two orders of magnitude faster than the existing response time of nematic liquid crystal devices. By applying a low electric field(v = 6 v) to the FLC CDg, it is switched between the eight-order diffractive state and the transmissive diffraction-free state.

关键词： ferroelectric liquid crystals photo-alignment fast switching diffractive optical elements

Liquid Crystal-Based Hydrophone Arrays

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Photonic Sensors 2012年第3期2卷 237-246页

作者： Zourab BRODZEL Leonardo SILvESTRI Andrew MICHIE vladimir g. chigrinov Qi gUO Eugene R POZHIDAEv Alexei D. KISELEv Francois LADOUCEUR School of Electrical Engineering and Telecommunications UNSW Sydney NSW 2052 Australia Smart Digital Optics Pry. Ltd. Suite 145 National Innovation Centre 4 Cornwallis Street Australian Technology ParkEveleigh NSW Australia 2015 CDR Department of Electrical and Electronic Engineering The Hong Kong University of Science and TechnologyClear Water Bay Kowloon Hong Kong China p.N. Lebedev Physics Institute of Russian Sciences Leninsky Prospect 53 117924 Moscow Russia Institute of Physics of National Academy of Sciences of Ukraine Prospekt Nauki 46 03028 Kyǐv Ukraine

We describe a fiber optic hydrophone array system that could be used for underwater acoustic surveillance applications （e.g. military, counter terrorist, and customs authorities in protecting ports and harbors）, offshore production facilities or coastal approaches as well as various marine applications. In this paper, we propose a new approach to underwater sonar systems using the voltage-controlled liquid crystals and simple multiplexing method. The proposed method permits measurement of sound under water at multiple points along an optical fiber using the low cost components and standard single mode fiber, without complex interferometric measurement techniques, electronics or demodulation software.

关键词： Ferroelectric liquid crystal electrooptic response hydrophone sonar deformed helix ferroelectricliquid crystal fiber Bragg grating