Polarimetric Measurement of Jones Matrix of a Twisted Nematic Liquid Crystal Spatial Light Modulator

Tsogvoo, Khos-Ochir; Munkhbaatar, Purevdorj; Yang, Byung Kwan; Kim, Hyun Woo; Kim, Jin Seung; Myung-Whun, Kim

doi:10.3807/josk.2012.16.4.443

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…Polarimetric experimental methods are available to determine the Jones matrix elements of transparent optical materials without sign ambiguity. 102 For scattering tissues, the direct measurements of Jones matrix elements can be done using a two-frequency Zeeman laser, which produces two laser lines with a small frequency separation (∼250 kHz) and orthogonal linear polarizations, 38 or by the OCT technique. 15,103 However, more often, Stokes or Mueller polarimeters based on intensity measurements of polarized light are used.…”

Section: Fundamentals Of Polarized Light Scatteringmentioning

confidence: 99%

Polarized light interaction with tissues

2016

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This tutorial-review introduces the fundamentals of polarized light interaction with biological tissues and presents some of the recent key polarization optical methods that have made possible the quantitative studies essential for biomedical diagnostics. Tissue structures and the corresponding models showing linear and circular birefringence, dichroism, and chirality are analyzed. As the basis for a quantitative description of the interaction of polarized light with tissues, the theory of polarization transfer in a random medium is used. This theory employs the modified transfer equation for Stokes parameters to predict the polarization properties of single- and multiple-scattered optical fields. The near-order of scatterers in tissues is accounted for to provide an adequate description of tissue polarization properties. Biomedical diagnostic techniques based on polarized light detection, including polarization imaging and spectroscopy, amplitude and intensity light scattering matrix measurements, and polarization-sensitive optical coherence tomography are described. Examples of biomedical applications of these techniques for early diagnostics of cataracts, detection of precancer, and prediction of skin disease are presented. The substantial reduction of light scattering multiplicity at tissue optical clearing that leads to a lesser influence of scattering on the measured intrinsic polarization properties of the tissue and allows for more precise quantification of these properties is demonstrated.

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Section: Fundamentals Of Polarized Light Scatteringmentioning

confidence: 99%

Polarized light interaction with tissues

2016

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“…The first one models the liquid crystal molecules and how they affect light 7,8 . The second one ignores the physical mechanism of how light is affected and considers only the light variations [9][10][11][12][13][14][15][16] . This second method has the advantage that can be used for any SLM, as it does not require prior knowledge about the SLM fabrication materials.…”

Section: Introductionmentioning

confidence: 99%

“…Refs. [13][14][15][16] directly characterize the behavior of the SLM in amplitude or phase modulation, and try to optimize it. Refs.…”

Section: Introductionmentioning

confidence: 99%

Calibration of the complete Jones matrix of SLMs

Hoyo

Sanchez‐Brea

Soria-García

2021

Optical Instrument Science, Technology, and Applications II

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Spatial light modulators are very common in many applications. They are used to implement amplitude, phase and polarization masks. In order to optimize its performance, it is important to characterize it, which means determining its Jones matrix. Here we present a method which consists on performing several intensity measurements for each gray level. It is simple enough that can be quickly performed, but offers much better results than previous methods.

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“…Several methods have been developed to achieve a suitable characterization of LCDs. They can be classified into two groups: (1) a model for the liquid crystal molecules is developed and the internal parameters are obtained [10][11][12][13], and (2) the LCD is considered as a polarization-changing device and its macroscopic parameters are searched for [14][15][16][17][18]. The first group suffers from the drawback that all LCDs are different and not necessarily all models can be applied to any LCD, nor is it known a priori which model must be employed for a specific model.…”

Section: Introductionmentioning

confidence: 99%

Least squares method for liquid crystal display characterization

et al. 2017

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This paper presents a method for liquid crystal display characterization. It assumes a liquid crystal display can be considered as a polarization-changing device described by a Jones matrix plus a global phase. The Jones matrix parameters are found by a least squares minimization based on global optimization techniques. The present method avoids the need for assigning experimental values to theoretical expressions, and it is robust against intensity fluctuations, does not require arbitrarily fixing any sign of the parameters estimated, and only one quarterwave plate is employed. A comparative analysis of the results obtained with this method and previous ones is performed. Having completely characterized a liquid crystal display, a phase-mostly configuration is obtained and experimentally verified.

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Polarimetric Measurement of Jones Matrix of a Twisted Nematic Liquid Crystal Spatial Light Modulator

Cited by 10 publications

References 11 publications

Polarized light interaction with tissues

Polarized light interaction with tissues

Calibration of the complete Jones matrix of SLMs

Least squares method for liquid crystal display characterization

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