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

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

作者：郭琦刘恬王骁乾郑致刚 Aleksey Kudreyko 赵慧洁 V.Chigrinov 郭海成 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

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Helix unwinding in ferroelectric liquid crystals induced by tilted electric field

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Chinese Physics B 2015年第7期24卷 341-344页

作者： Nail G.Migranov Aleksey A.Kudreyko Bashkir State Pedagogical University Department of General and Theoretical Physics Ufa State Petroleum Technological University Department of Physics

Helix unwinding in ferroelectric liquid crystals induced by an electric field is theoretically studied on the basis of the continuum theory. By applying a weak electric field tilted to the smectic layers, the contribution of the dielectric interaction energy density to the total free energy density is increased. Approximation methods are used to calculate the free energy for different tilt angles between the electric field and the smectic layers. The obtained results suggest selecting the optimal number of pitches in the film that matches to the minimum of the free energy.

关键词： ferroelectric liquid crystals helicoidal structure thin films Euler's equation

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Analysis of Dielectric and Electro-optic Responses of Nanomaterials Doped ferroelectric liquid Crystal Mixture

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Journal of Materials Science & Technology 2011年第12期27卷 1094-1098页

作者： Neeraj Pankaj Kumar K.K. Raina Material Research Laboratory School of Physics and Materials Science Thapar University Patiala 147004 India Department of BIN Fusion Technology Chonbuk National University Jeonju Jeonbuk 561-756 Korea Department of Applied Science Chitkara University Jansala Rajpura Patiala-140401 Punjab India

Dielectric and rotational viscosity measurements of a multi-component ferroelectric liquid crystal mixture were performed by adding a small concentration （0.01 wt%） of silica and multi walled carbon nanotubes （MWCNTs）. liquid crystals turn out to be outstanding hosts for nanomaterials. A remarkable increase in the rotational viscosity was noticed in CNT doped system as compared to silica doped same liquid crystal system. Comparison of dielectric studies shows higher value of permittivity and dielectric losses for silica-doped sample than those of CNT doped sample. The results have been interpreted both experimentally and theoretically.

关键词： ferroelectric liquid crystals Silica nanoparticles Carbon nanotubes Dielectricpermittivity Rotational viscosity

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