Mueller-Stokes characterization and optimization of a liquid crystal on silicon display showing depolarization

Márquez, Andrés; Moreno, Ignacio; Iemmi, Claudio; Lizana, Ángel; Campos, Juan; Yzuel, María Josefa

doi:10.1364/oe.16.001669

Cited by 84 publications

(117 citation statements)

References 33 publications

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“…3 Liquid crystal on silicon (LCoS) displays have become the most attractive microdisplays for these applications due to their very high spatial resolution and very high light efficiency. 4,5 However, several authors [6][7][8][9][10][11] have detected that LCoS displays produce a certain amount of phase flicker and/or depolarization. Among the different LCoS technologies typically available, parallel aligned LCoS (PA-LCoS) are especially interesting since they allow easy operation as phase-only devices without coupled amplitude modulation.…”

Section: Introductionmentioning

confidence: 99%

Extended linear polarimeter to measure retardance and flicker: application to liquid crystal on silicon devices in two working geometries

et al. 2014

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Abstract. We focus on the evaluation of the applicability of the classical and well-established linear polarimeter to the measurement of linear retardance in the presence of phase flicker. This analysis shows that there are large errors in the results provided by the linear polarimeter when measuring the linear retardance of a device. These errors depend on the specific retardance value under measurement. We show that there are some points where this limitation can be used to measure the fluctuation amplitude consistently. An elegant method is further proposed, enabling the measurement of the average retardance value, thus extending the applicability of the classical linear polarimeter. Experimental characterization results are provided for various electrical sequences addressed onto a parallel aligned liquid crystal on silicon (LCoS) display. Good agreement is obtained with experiment, thus validating the linear polarimeter methodology proposed. Furthermore, results are provided for the LCoS in two reflection geometries, perpendicular incidence with and without nonpolarizing beam splitter, demonstrating robustness of the method. As a result, the evaluation of both phase modulation range and flicker magnitude for any electrical sequence addressed can be easily obtained, which is very important for optimal use of LCoS displays in applications.

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Section: Introductionmentioning

confidence: 99%

Extended linear polarimeter to measure retardance and flicker: application to liquid crystal on silicon devices in two working geometries

et al. 2014

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“…To this aim, since Jones matrices contains the required phase information, a conversion of the experimentally obtained LCoS display Mueller matrices to Jones matrices is applied. As stated above, LCoS displays introduce a certain amount of unpolarized light in the reflected beam (Lizana et al, 2008a;Márquez et al, 2008;Wolfe & Chipman, 2006). Since Jones matrices do not describe unpolarized samples, a direct conversion from the experimental Mueller matrices to the Jones matrices can not be directly performed.…”

Section: Mueller To Jones Conversion: Phase Predictionmentioning

confidence: 99%

“…In the case of LCoS displays, diverse polarimetric studies have proved that they are non-diattenuating devices (Lizana et. al, 2008c;Lizana et al, 2009;Márquez et al, 2008) and the corresponding M D matrices can be approximated to the identity matrix. Therefore, when applying the Lu-Chipman polar decomposition to the LCoS display case, the following relation holds :…”

Section: Mueller To Jones Conversion: Phase Predictionmentioning

confidence: 99%

“…In general, most of these models are based on mathematical formalisms describing fully polarized light, as the Jones formalism (Jones, 1941) or the Berreman formalism (Berreman, 1972). However, some authors have discovered that LCoS displays may introduce non-negligible values of effective depolarization at the reflected beam (Lizana et al, 2008a;Márquez et al, 2008;Wolfe & Chipman, 2006), which are originated by the electrical addressing schemes applied in these devices (Hermerschmidt et al, 2007). This effective depolarization depends on the incident angle (Lizana et al, 2009;Verma et al, 2010), the wavelength (Lizana et al, 2008c) and the state of the polarization of the incident beam .…”

Section: Introductionmentioning

confidence: 99%

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Study of Liquid Crystal on Silicon Displays for Their Application in Digital Holography

Lizana¹,

Lobato²,

Márquez³

et al. 2011

Advanced Holography - Metrology and Imaging

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“…For that purpose, the Mueller matrix formalism provides an alternative description. This approach is especially relevant to show evidence of a certain degree of depolarized light in the displays [6][7][8]. The Mueller approach has also been used to find LCD configurations leading to a phase-only modulation.…”

mentioning

confidence: 99%

Combined Mueller and Jones matrix method for the evaluation of the complex modulation in a liquid-crystal-on-silicon display

et al. 2008

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We apply the polar decomposition of the Mueller matrix describing a liquid-crystal-on-silicon display to identify the diattenuator, depolarizer, and retarder contributions as a function of the gray level. The retarder contribution is expressed in terms of the equivalent Jones matrix to apply previous techniques to evaluate the phase modulation. This allows searching for optimized polarization configurations for phase-or amplitude-only modulation responses. We present results for = 633 nm showing a phase-only modulation up to 2 rad and flat intensity modulation. © 2008 Optical Society of America OCIS codes: 230.3720, 230.6120, 260.5430. Liquid crystal displays (LCDs) have found widespread use as spatial light modulators (SLMs) in applications such as optical image processing, holographic data storage, programmable adaptive and diffractive optics, and optical metrology. For all these applications, their configuration as phase-only SLMs is very important to obtain high values of the diffraction efficiency [1]. This situation is achieved when the input and output polarization configurations are properly selected [2]. In recent years new liquidcrystal-on-silicon (LCoS)-based displays have attracted considerable interest due to their high resolution and excellent fill factor [3]. They are reflective displays that, due to the double pass through the device, allow for an increased phase modulation depth compared to previous twisted nematic (TN) LCDs. Several methods have been proposed to evaluate and predict the phase modulation for different polarization configurations. They usually employ the Jones matrix formalism [4,5], since the complex (amplitude and phase) modulation can be directly evaluated. However, the Jones formalism does not account for such other important polarimetric parameters as diattenuation and depolarization. For that purpose, the Mueller matrix formalism provides an alternative description. This approach is especially relevant to show evidence of a certain degree of depolarized light in the displays [6][7][8]. The Mueller approach has also been used to find LCD configurations leading to a phase-only modulation. For instance, Pezzaniti and Chipman [9] measured the Mueller matrix of a TN-LCD and calculated its average eigenpolarization states. More recently, the trajectory on the Poincaré sphere and its modification with external wave plates has also been employed with a TN-LCD [10]. These methods very elegantly and efficiently lead to a constant intensity configuration, but the phase modulation cannot be evaluated a priori and has to be measured. However, the possibility of predicting the phase-modulation is very desirable, since the phasemodulation depth can be increased in configurations with flat but no maximum intensity modulation [11].In this work we combine the Mueller and Jones approaches to perform a complete characterization of a LCoS display. We use results of a previous polarimetric characterization of the display based on the Mueller matrix approach [8], which showed up to 10% of th...

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Mueller-Stokes characterization and optimization of a liquid crystal on silicon display showing depolarization

Cited by 84 publications

References 33 publications

Extended linear polarimeter to measure retardance and flicker: application to liquid crystal on silicon devices in two working geometries

Extended linear polarimeter to measure retardance and flicker: application to liquid crystal on silicon devices in two working geometries

Study of Liquid Crystal on Silicon Displays for Their Application in Digital Holography

Combined Mueller and Jones matrix method for the evaluation of the complex modulation in a liquid-crystal-on-silicon display

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