Journal ArticleDOI
Infrared Properties Of Nematic Liquid Crystals: An Overview
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TLDR
In this paper, the authors reviewed the properties and electro-optic effects of nematic liquid crystals and discussed the advantages and disadvantages of three device configurations (parallel, twisted, and perpendicular alignment) for long-wavelength applications.Abstract:
Infrared properties and electro-optic effects of nematic liquid crystals are reviewed. Physical origins and characterization techniques of infrared birefringence and rotatory power are described. Advantages and disadvantages of three device configurations--parallel, twisted, and perpendicular alignments--are analyzed. Among them, parallel alignment shows the best potential for long-wavelength applications. Several methods for improving the response times of nematic liquid crystals with emphasis in the infrared region are briefly discussed.read more
Citations
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Thermal diodes, regulators, and switches: Physical mechanisms and potential applications
Geoff Wehmeyer,Tomohide Yabuki,Tomohide Yabuki,Christian Monachon,Junqiao Wu,Junqiao Wu,Chris Dames,Chris Dames +7 more
TL;DR: In this paper, the fundamental physical mechanisms of switchable and nonlinear heat transfer have been harnessed to make thermal diodes, switches, and regulators, and various nonlinear and active thermal circuits are presented.
Journal ArticleDOI
High-efficiency liquid-crystal optical phased-array beam steering
TL;DR: Efficient, electrically tunable, agile, inertialess, near-diffraction-limited one-dimensional optical beam steering is demonstrated at the infrared wavelength of 10.6 microm with a liquid-crystal phased array.
Journal ArticleDOI
High Birefringence Liquid Crystals
TL;DR: In this paper, the mesogenic properties and physical chemical properties (viscosity, birefringence, refractive indices, dielectric anisotropy and elastic constants) of compounds being cyano, fluoro, isothiocyanato derivatives of biphenyl, terphenyl and quaterphenyl, tolane, phenyl tolane and phenyl ethynyl tolan, and biphenynyl-tolane are compared.
Journal ArticleDOI
Diffraction efficiency analysis of a parallel-aligned nematic-liquid-crystal spatial light modulator.
TL;DR: The diffraction efficiency of near-sinusoidal gratings written on the device is of the order of 30%, which is close to theoretical maximum, and a comparison between the experimental results and the theoretical analysis shows good agreement.
Journal ArticleDOI
Optimal operation temperature of liquid crystal modulators.
TL;DR: It is demonstrated that the LCs or LC mixtures with higher nematic-isotropic phase transition temperatures have higher optimum temperatures and greater potential for improving the figure of merit.
References
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Journal ArticleDOI
Voltage-Dependent Optical Activity of a Twisted Nematic Liquid Crystal
Martin Schadt,Wolfgang Helfrich +1 more
TL;DR: In this paper, a new electrooptical effect in twisted nematic liquid crystals is described which allows variation of the rotation of linearly polarized light continuously from 0° to 90°.
Journal ArticleDOI
Birefringence dispersions of liquid crystals.
TL;DR: T theory on the quantitative birefringence dispersions of liquid crystals was developed and found to have excellent agreement with experimental results throughout the entire visible and infrared spectral regions.
Journal ArticleDOI
Birefringence measurements of liquid crystals
Shin-Tson Wu,Uzi Efron,L.D. Hess +2 more
TL;DR: A liquid crystal based phase retardation plate which can be voltage tuned and calibrated to provide any degree of phase shift from 0 to 2π over a wide wavelength range (0.4–16 μm) is discussed.
Journal ArticleDOI
The optical properties of twisted nematic liquid crystal structures with twist angles ⩽90 degrees
C H Gooch,H A Tarry +1 more
TL;DR: In this paper, it was shown that a liquid-crystal twisted nematic structure can be made with twist angles other than the conventional 90 degrees, and that theoretically the transmission of such a structure when placed between two polarizers aligned parallel and perpendicular to the respective surface molecular directors is given by T=( 1+u2)-1 sin2( theta (1+u 2)12/) where u= pi d Delta n/ theta lambda, and theta is the twist angle, d being the cell thickness, Delta n the refractive index anisotropy
Journal ArticleDOI
A new, highly multiplexable liquid crystal display
T. J. Scheffer,J. Nehring +1 more
TL;DR: In this article, a chiral-doped nematic layer with tilted boundaries and a twist angle of ∼270° was used for a 120×240 dot matrix panel multiplexed at a 1/120 duty cycle.