Electrical dependencies of optical modulation capabilities in digitally addressed parallel aligned liquid crystal on silicon devices

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Title: Electrical dependencies of optical modulation capabilities in digitally addressed parallel aligned liquid crystal on silicon devices
Authors: Martínez Guardiola, Francisco Javier | Márquez, Andrés | Gallego, Sergi | Ortuño, Manuel | Francés, Jorge | Beléndez, Augusto | Pascual, Inmaculada
Research Group/s: Holografía y Procesado Óptico
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía | Universidad de Alicante. Instituto Universitario de Física Aplicada a las Ciencias y las Tecnologías
Keywords: Liquid crystal on silicon displays | Parallel aligned | Retardance measurement | Phase-only modulation | Spatial light modulation | Flicker | Diffractive optics | Pulse width modulation
Knowledge Area: Óptica | Física Aplicada
Date Created: 4-Apr-2014
Issue Date: 1-Jun-2014
Publisher: SPIE, The International Society for Optics and Photonics
Citation: Martínez F, Márquez A, Gallego S, et al; Electrical dependencies of optical modulation capabilities in digitally addressed parallel aligned liquid crystal on silicon devices. Opt. Eng. 0001;53(6):067104. doi:10.1117/1.OE.53.6.067104
Abstract: Parallel aligned liquid crystal on silicon (PA-LCoS) displays have found wide acceptance in applications requiring phase-only modulation. Among LCoS devices, and PA-LCoS as a specific case, digital addressing has become a very common technology. In principle, modern digital technology provides some benefits with respect to analog addressing such as reduced interpixel cross-talk, lower power consumption and supply voltage, gray level scale repeatability, high programmability, and noise robustness. However, there are also some degradating issues, such as flicker, which may be enhanced. We analyze the characteristics of the digital pulse width modulated voltage signals in relation to their effect on the optical modulation capabilities of LCoS displays. We apply calibration techniques developed in our laboratory, basically the classical linear polarimeter extended to take into account the existence of flicker. Various digital sequence formats are discussed, focusing the analysis on the variations in the magnitude of the applied voltages across the LC layer. From this analysis, we obtain how to amplify the retardance dynamic range and how to enhance linearity in the device without enhancing flicker and without diminishing the number of available quantization levels. Electrical configurations intended for phase-only and intensity modulation regimes, useful in diffractive optics, are given.
Sponsor: This work was supported by the Ministerio de Trabajo y Competitividad of Spain (projects FIS2011-29803-C02-01 and FIS2011-29803-C02-02), by the Generalitat Valenciana of Spain (projects PROMETEO/2011/021 and ISIC/2012/013), and by the Universidad de Alicante (project GRE12-14).
URI: http://hdl.handle.net/10045/39342
ISSN: 0091-3286 (Print) | 1560-2303 (Online)
DOI: 10.1117/1.OE.53.6.067104
Language: eng
Type: info:eu-repo/semantics/article
Rights: Copyright 2014 Society of Photo-Optical Instrumentation Engineers. This paper was published in Opt. Eng. 53(6) (Jun. 2014) and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Peer Review: si
Publisher version: http://dx.doi.org/10.1117/1.OE.53.6.067104
Appears in Collections:INV - GHPO - Artículos de Revistas

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