Optical Components, Detectors, and Displays

Phase-modulating bistable optically addressed spatial light modulators using wide-switching-angle ferroelectric liquid crystal layer

[+] Author Affiliations
Solon Mias

Institut d’Optique, Centre Scientifique, Bat.503, 91403, Orsay, Cedex, France E-mail: Solon.Mias@iota.u-psud.fr

Ilias G. Manolis

Universita` degli Studi di Roma “La Sapienza”, Istituto Nazionale per la Fisica della Materia, Dipartimento di Ingegneria Elettronica, Via Eudossiana 18, 00184, Roma, Italy

Neil Collings, Timothy D. Wilkinson, William A. Crossland

Photonics and Sensors Group, Department of Engineering,, Trumpington Street, Cambridge, CB2 1PZ, United Kingdom.

Opt. Eng. 44(1), 014003 (Dec. 27, 2004). doi:10.1117/1.1828471
History: Received Feb. 18, 2004; Revised Jun. 11, 2004; Accepted Jul. 1, 2004; Dec. 27, 2004; Online December 27, 2004
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We report the use of an experimental ferroelectric liquid crystal material called CDRR8 in bistable optically addressed spatial light modulators for both amplitude- and phase-modulating devices. First, the methods used to improve the alignment and obtain truly bistable switching with CDRR8 are described. The diffraction efficiency and switching characteristics of a bistable CDRR8 optically addressed spatial light modulator used as an amplitude-modulating device and then as a phase-modulating device for encoding high-resolution patterns are compared. The CDRR8 devices exhibit bistability when driven by alternating monopolar pulses. The results show that the use of a device as a phase-modulating rather than an amplitude-modulating device, increases the diffraction efficiency by 10 times. Resolution is better than 100 lp/mm, as measured by the fall in diffraction efficiency by 50% compared with the diffraction efficiency at low spatial frequencies. © 2005 Society of Photo-Optical Instrumentation Engineers.

© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Solon Mias ; Ilias G. Manolis ; Neil Collings ; Timothy D. Wilkinson and William A. Crossland
"Phase-modulating bistable optically addressed spatial light modulators using wide-switching-angle ferroelectric liquid crystal layer", Opt. Eng. 44(1), 014003 (Dec. 27, 2004). ; http://dx.doi.org/10.1117/1.1828471


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