Journal ArticleDOI
Unique measurement of the parameters of a twisted-nematic liquid-crystal display
Hyun You Kim,Yeon H. Lee +1 more
TLDR
A phase spatial light modulator is designed by using the measured parameters and measure the phase delay of the output beam to excellent agreement with the theoretical prediction.Abstract:
The parameters of a twisted-nematic liquid-crystal display (TN-LCD) are measured with no ambiguity when we measure the intensity transmittance of a system that simply consists of a TN-LCD, two polarizers, a quarter-wave plate, and a monochromatic beam. First we show analytically that the director angle can have a 90° ambiguity and the twist angle of the liquid-crystal molecules a 180° ambiguity. Then we uniquely measure the parameters by fitting the theoretical predictions to the intensity transmittance measured with and without the quarter-wave plate and by using the quasi local-adiabatic condition. The birefringence of the TN-LCD is measured next as a function of the applied voltage. We design a phase spatial light modulator by using the measured parameters and measure the phase delay of the output beam to excellent agreement with the theoretical prediction. © 2005 Optical Society of Americaread more
Citations
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Journal ArticleDOI
Pattern recognition with an adaptive joint transform correlator.
TL;DR: An adaptive joint transform correlator for real-time pattern recognition is presented and a reference image for the correlator is generated with a new iterative algorithm based on synthetic discriminant functions.
Journal ArticleDOI
Hybrid Ternary Modulation Applied to Multiplexing Holograms in Photopolymers for Data Page Storage
TL;DR: In this article, a hybrid ternary modulation (HTM) was used to reduce the zero frequency of the Fourier transform of an object's Fourier beam, and a liquid crystal device was optimized to modify the object beam to obtain data pages with the HTM.
Journal ArticleDOI
Generation of fractal speckles by means of a spatial light modulator.
Hideki Funamizu,Jun Uozumi +1 more
TL;DR: A generation of fractal speckles by means of a spatial light modulator is proposed and experimental results are shown.
Journal ArticleDOI
Multiplexed holographic data page storage on a polyvinyl alcohol/acrylamide photopolymer memory
Elena Fernández,Manuel Ortuño,Sergi Gallego,Andrés Márquez,Celia García,Augusto Beléndez,Inmaculada Pascual +6 more
TL;DR: Holographic data pages were multiplexed in different thickness layers of a polyvinyl alcohol/acrylamide photopolymer to determine what parameters improve the quality of the images.
Journal ArticleDOI
Real-time digital holographic beam-shaping system with a genetic feedback tuning loop
TL;DR: A novel implementation of a real-time digital holographic system with a genetic feedback tuning loop is proposed that is effective in encoding optimal phase holograms on a liquid-crystal spatial light modulator in the system.
References
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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.
Journal ArticleDOI
Phase-only modulation with twisted nematic liquid-crystal spatial light modulators.
TL;DR: It is shown that twisted nematic liquid-crystal spatial light modulators behave as phase-only modulators when operated below the conventional optical threshold and behave as spatial amplitude modulator when used between crossed polarizers above the optical threshold.
Journal ArticleDOI
Optical-data-processing properties of a liquid-crystal television spatial light modulator.
TL;DR: It is discovered that the extremely inexpensive Radio Shack liquid-crystal television, with proper modifications, has potential for optical-data-processing applications.
Journal ArticleDOI
Polarization eigenstates for twisted-nematic liquid-crystal displays.
TL;DR: It is shown that superior phase-only operation can be obtained over a given operating range for the LCD compared with other approaches and that the eigenvectors are elliptically polarized.
Journal ArticleDOI
Determination of the physical properties of an arbitrary twisted-nematic liquid crystal cell
Colin Soutar,Kanghua Lu +1 more
TL;DR: In this paper, an experimental procedure for the determination of the physical properties of an arbitrary twisted-nematic liquid crystal cell was presented, and the results showed that there is significant variation in the birefringence across this cell and the influence that this has on the use of the cell in optical processing systems.
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