Journal ArticleDOI
Complex amplitude reflectance of the liquid crystal light valve.
Kanghua Lu,Bahaa E. A. Saleh +1 more
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TLDR
The theoretical results based on this model match the experimental measurements and allow us to optimize the operation of the LCLV as an intensity or phase-only spatial light modulator.Abstract:
The complex amplitude reflectance of the liquid crystal light valve (LCLV) is determined as a function of the writing intensity and applied voltage using an approximate model. The input and output polarizers are assumed to have arbitrary directions. The theoretical results based on this model match our experimental measurements. This theory allows us to optimize the operation of the LCLV as an intensity or phase-only spatial light modulator. When the polarizers are orthogonal and the input polarizer is at -34 degrees with the front liquid crystal director, the intensity reflectance reaches 100% (compared to 81% for the conventional configuration). Phase-only modulation is realizable by use of appropriate applied voltage bias and configuration of polarizers.read more
Citations
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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.
Optimal realizable filters and the minimum Euclidean distance principle. [for spatial light modulators]
TL;DR: In this paper, the Euclidean distance minimization in the complex plane optimizes a wide class of correlation metrics for filters implemented on realistic devices, including spatial light modulators, additive input noise (white or colored), spatially nonuniform filter modulators and additive correlation detection noise (including signaldependent noise).
Journal ArticleDOI
Full-range, continuous, complex modulation by the use of two coupled-mode liquid-crystal televisions
TL;DR: Switchable, continuous, complex-amplitude modulation is demonstrated with two cascaded, twisted nematic liquid-crystal televisions, both operating in phase- and amplitude-coupled modulation modes.
Journal ArticleDOI
Phase-only modulation of a twisted nematic liquid-crystal TV by use of the eigenpolarization states
TL;DR: The eigenpolarization states of a commercially available liquid-crystal television display are presented and it is shown that phase-only modulation can be achieved over a large dynamic range of video voltages for several bias voltage settings if the eigenmagnification states are used.
Journal ArticleDOI
Full complex modulation using liquid-crystal televisions
TL;DR: An optical architecture is proposed that uses two modified liquid-crystal televisions (LCTV's) to control amplitude and phase modulation independently and two applications in pattern recognition are discussed.
References
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Journal ArticleDOI
Optics in Stratified and Anisotropic Media: 4×4-Matrix Formulation
TL;DR: A 4×4-matrix technique was introduced by Teitler and Henvis as discussed by the authors to solve the problem of reflection and transmission by cholesteric liquid crystals and other liquid crystals with continuously varying but planar ordering.
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
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
Theory and design of the liquid crystal TV as an optical spatial phase modulator
Bahaa E. A. Saleh,Kanghua Lu +1 more
TL;DR: In this article, an expression for the complex amplitude transmittance of the liquid crystal TV (LCTV) and verified experimentally was derived for spatial phase modulation with good linearity, high transmission efficiency, and small intensity distortion.
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Theory and design of the liquid crystal TV as an optical spatial phase modulator
Bahaa E. A. Saleh,Kanghua Lu +1 more