Poincaré-sphere representation of phase-mostly twisted nematic liquid crystal spatial light modulators
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
Poincaré-sphere representation of phase-mostly twisted nematic liquid crystal spatial light modulatorsAuthor (s)
Date
2009Publisher
Institute of PhysicsISSN
1464-4258Bibliographic citation
DURÁN, Vicente, et al. Poincaré-sphere representation of phase-mostly twisted nematic liquid crystal spatial light modulators. Journal of Optics A: Pure and Applied Optics, 2009, vol. 11, no 8, p. 08540Type
info:eu-repo/semantics/articlePublisher version
https://iopscience.iop.org/article/10.1088/1464-4258/11/8/085403/pdfVersion
info:eu-repo/semantics/submittedVersionSubject
Abstract
We establish necessary conditions in order to design a phase-only wave front modulation system from
a liquid crystal display. These conditions determine the dependence of the polarization state of the
light emerging ... [+]
We establish necessary conditions in order to design a phase-only wave front modulation system from
a liquid crystal display. These conditions determine the dependence of the polarization state of the
light emerging from the display on the addressing gray level. The analysis, which is carried out by
means of the coherence-matrix formalism, includes the depolarization properties of the device. Two
different types of polarization distributions at the output of the liquid crystal cells are found. This
approach is applied to a twisted nematic liquid crystal display. In this case, an optimization algorithm
must be designed in order to select the input polarization state that leads to the required distributions.
We show that the Poincaré-sphere representation provides a convenient framework to design the
optimization algorithm as it allows for a reduced number of degrees of freedom. This feature
significantly decreases the computation time. Laboratory results are presented for a liquid crystal-onsilicon
display showing a phase modulation depth greater than 2π radians with an intensity variation
lower than 6%. In addition, a hybrid-ternary modulation (HTM), an operation regime employed in
holographic data storage, is achieved [-]
Is part of
Journal of Optics A: Pure and Applied Optics, 2009, v. 11, n. 8Rights
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