Journal ArticleDOI
Optimization of the contrast ratio of a ferroelectric liquid crystal optical modulator
Antonio Martínez,Nicolas Beaudoin,Ignacio Moreno,María del Mar Sánchez-López,Pablo Velasquez +4 more
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TLDR
In this article, a switchable wave-plate is used to produce a binary intensity modulation when the phase shift introduced between the principal axes is equal to π radians, and a simple technique is presented to optimize the response of a ferroelectric liquid crystal (FLC) optical modulator to obtain a highly contrasted intensity modulation.Abstract:
In this work we present a simple method for the characterization of a ferroelectric liquid crystal (FLC) optical modulator and the optimization of its contrast ratio. This device acts as switchable wave-plate, where the orientations of the principal axes rotate under the action of a bipolar applied voltage. It is designed to produce a binary intensity modulation when the phase shift introduced between the principal axes is equal to π radians. We present a simple technique to optimize its response when the phase shift differs from this ideal value, in order to produce a highly contrasted intensity modulation. The technique uses elliptically polarized light and requires the use of an additional quarter-wave-plate. This situation is experimentally demonstrated using a commercially available ferroelectric liquid crystal cell and two He–Ne lasers with wavelengths of 543 and 633 nm, respectively.read more
Citations
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Journal ArticleDOI
Polarimetric method for liquid crystal displays characterization in presence of phase fluctuations
TL;DR: A polarimetry based method able to characterize optical properties of linear Liquid Crystal Displays (LCDs), even in presence of time-fluctuations of the phase, is proposed, and mean linear retardance, Liquid Crystal (LC) fast axis orientation and phase fluctuation amplitude of LCDs can be obtained with the proposed alternative technique.
Journal ArticleDOI
Wavelength-compensated color Fourier diffractive optical elements using a ferroelectric liquid crystal on silicon display and a color-filter wheel
TL;DR: This work describes the experimental realization of a simple scheme capable of implementing RGB improved dynamic color binary-phase Fourier computer-generated holograms by means of a single ferroelectric liquid crystal on silicon (FLCOS) display and an electronically controlled color-filter wheel.
Journal ArticleDOI
Optimization and tolerance analysis of a polarimeter with ferroelectric liquid crystals
TL;DR: The design of Stokes and Mueller polarimeters based on ferroelectric liquid crystal (FLC) panels are presented, and some experimental measurements of different Stokes vectors and Mueller matrices are provided, validating the proposed prototypes.
Journal ArticleDOI
Matched-filtering generalized phase contrast using LCoS pico-projectors for beam-forming
TL;DR: A new beam-forming system for generating high intensity programmable optical spikes using so-called matched-filtering Generalized Phase Contrast (mGPC) applying two consumer handheld pico-projectors, presenting a low-cost alternative for optical trapping and manipulation, optical lattices and other beam-shaping applications usually implemented with high-end spatial light modulators.
Journal ArticleDOI
Operational modes of a ferroelectric LCoS modulator for displaying binary polarization, amplitude, and phase diffraction gratings
TL;DR: This analysis of the performance of a ferroelectric liquid crystal on silicon display (FLCoS) as a binary polarization diffraction grating and two useful variations of the polarization configuration are presented.
References
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Book
Polarization of Light
TL;DR: Polarized optical waves light propagation in an anisotropic dielectric medium Propagation of the States of Polarization in Optical Devices Stress-Induced or Stress-Modified Anisotropic Components and Devices Used in the Context of Optical Anisotropy Polarization Phenomena in the Fied of Guided Waves Appendices.
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Polarization eigenstates for twisted-nematic liquid-crystal displays.
TL;DR: It is shown that superior phase-only operation can be obtained over a given operating range for the LCD compared with other approaches and that the eigenvectors are elliptically polarized.
Journal ArticleDOI
Complex amplitude modulation by use of liquid-crystal spatial light modulators
TL;DR: The conditions for implementation of complex amplitude modulation on standard liquid-crystal spatial light modulators when illuminated by polarized light are proposed and first attempt at nomenclature is proposed.
Journal ArticleDOI
Phase and amplitude modulation of elliptic polarization states by nonabsorbing anisotropic elements: application to liquid-crystal devices
TL;DR: It is demonstrated that once the programmable birefringent device is described by a physical model, the amplitude and phase modulation depend only on the polarization state at the input of the device and on the output state detected behind it.
Journal ArticleDOI
Reconfigurable multilevel phase holograms for optical switches
TL;DR: In this paper, a way of dynamically encoding polarization-insensitive multilevel phase holograms using nematic liquid crystals is presented, which allows the optical efficiency of a free space single-mode fiber-to-fiber switch to be greatly enhanced.