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

Francisco Javier Martínez; Andrés Márquez; Sergi Gallego; Manuel Ortuño; Jorge Francés; Augusto Beléndez; Inmaculada Pascual

doi:10.1117/1.OE.53.6.067104

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24 June 2014 Electrical dependencies of optical modulation capabilities in digitally addressed parallel aligned liquid crystal on silicon devices

Francisco Javier Martínez, Andrés Márquez, Sergi Gallego, Manuel Ortuño, Jorge Francés, Augusto Beléndez, Inmaculada Pascual

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Optical Engineering, 53(6), 067104 (2014). https://doi.org/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.

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Francisco Javier Martínez, Andrés Márquez, Sergi Gallego, Manuel Ortuño, Jorge Francés, Augusto Beléndez, and Inmaculada Pascual "Electrical dependencies of optical modulation capabilities in digitally addressed parallel aligned liquid crystal on silicon devices," Optical Engineering 53(6), 067104 (24 June 2014). https://doi.org/10.1117/1.OE.53.6.067104

Published: 24 June 2014

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