Journal ArticleDOI
Optical retarder system with programmable spectral retardance
Ignacio Moreno,José Vicente Carrión,José Luis Martínez,Pascuala García-Martínez,María del Mar Sánchez-López,Juan Campos +5 more
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TLDR
An optical system that works as a retarder waveplate with programmable spectral retardance that is based on a pixelated liquid crystal on silicon (LCoS) spatial light modulator (SLM).Abstract:
An optical system that works as a retarder waveplate with programmable spectral retardance is proposed. The system is based on a pixelated liquid crystal on silicon (LCoS) spatial light modulator (SLM). The input light beam is spectrally dispersed and different spectral components are projected onto different pixels of the LCoS-SLM. A different retardance is then addressed for each pixel, adapted to the incoming wavelength. Light reflected from the SLM is then recombined by the same setup. In this way a programmable polarization spectrum can be encoded. We illustrate the broadband characterization that is required for proper use of the system. Then several examples are shown, including spectral compensation to yield retarders with constant retardance, retarders with abrupt changes in the spectral retardance function, or bandpass variable retarder filters. The system is also demonstrated to provide programmable light spectrum generation.read more
Citations
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Journal ArticleDOI
Achromatic linear retarder with tunable retardance
Abdelghafour Messaadi,María del Mar Sánchez-López,Asticio Vargas,Pascuala García-Martínez,Ignacio Moreno +4 more
TL;DR: A universal design and proof-of-concept of a tunable linear retarder of uniform wavelength response in a broad spectral range that is experimentally demonstrated to control the state of polarization of a supercontinuum laser.
Journal ArticleDOI
Effective angular and wavelength modeling of parallel aligned liquid crystal devices
Francisco J. Martínez,Andrés Márquez,Sergi Gallego,Jorge Francés,Inmaculada Pascual,Augusto Beléndez +5 more
TL;DR: In this article, the authors proposed and demonstrated the validity of a novel model enabling to calculate the voltage dependent retardance provided by parallel-aligned liquid crystal (PA-LC) devices for a very wide range of incidence angles and any wavelength in the visible.
Journal ArticleDOI
Simplified physical modeling of parallel-aligned liquid crystal devices at highly non-linear tilt angle profiles.
Jorge Francés,Andrés Márquez,Francisco J. Martínez-Guardiola,Sergio Bleda,Sergi Gallego,Cristian Neipp,Inmaculada Pascual,Augusto Beléndez +7 more
TL;DR: A complete rigorous validation covering the full range of possible applied voltages, including highly non-linear liquid crystal (LC) tilt angle profiles, is developed and shown to demonstrate the applicability of the model for spectral and angular retardation calculations, of interest in spatial light modulation applications.
Journal ArticleDOI
Synthesis, Mesomorphism and the Optical Properties of Alkyl-deuterated Nematogenic 4-[(2,6-Difluorophenyl)ethynyl]biphenyls
Jakub Herman,Piotr Harmata,Michał Czerwiński,Olga Strzeżysz,Marta Pytlarczyk,Monika Zając,Przemysław Kula +6 more
TL;DR: In this paper, the synthesis and characterization of new deuterated liquid crystal (LC) compounds based on phenyl tolane core is described, which show enantiotropic nematic behavior in a broad temperature range, confirmed by polarizing thermomicroscopy and differential scanning calorimetry.
Journal ArticleDOI
Computational split-field finite-difference time-domain evaluation of simplified tilt-angle models for parallel-aligned liquid-crystal devices
Andrés Márquez,Jorge Francés,Francisco J. Martínez,Sergi Gallego,Mariela L. Alvarez,Eva M. Calzado,Inmaculada Pascual,Augusto Beléndez +7 more
TL;DR: Work supported by the Ministerio de Economia, Industria y Competitividad (Spain) (FIS2014-56100-C2-1P and FIS2015-66570-P) and by Generalitat Valenciana ( Spain) (PROMETEO II/2015/015) as discussed by the authors.
References
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PatentDOI
Measurement of waveplate retardation using a photoelastic modulator
TL;DR: In this paper, a photoelastic modulator (22) is employed in an optical setup and provides high sensitivity for measuring waveplate retardation, which is particularly appropriate for quality-control testing of waveplates.