High optical quality electrically variable liquid crystal lens using an additional floating electrode

Galstian, Tigran; Asatryan, K. E.; Presniakov, Vladimir; Zohrabyan, Armen; Tork, Amir; Bagramyan, Aram; Careau, S; Thiboutot, M; Cotovanu, M

doi:10.1364/ol.41.003265

Cited by 46 publications

(10 citation statements)

References 13 publications

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“…This typically requires the precise control of the applied voltage distribution over the active area of the LC device. To this end, different approaches have been proposed, the most important of which are the modal 35 – 37 and multielectrode 38 , 39 techniques. In the first case, a high resistivity layer distributes homogeneously the voltage across the active area.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Algorri

Morawiak

Zografopoulos

et al. 2020

Sci Rep

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there is an increasing need to control light phase with tailored precision via simple means in both fundamental science and industry. one of the best candidates to achieve this goal are electro-optical materials. In this work, a novel technique to modulate the spatial phase profile of a propagating light beam by means of liquid crystals (Lc), electro-optically addressed by indium-tin oxide (ito) grating microstructures, is proposed and experimentally demonstrated. A planar Lc cell is assembled between two perpendicularly placed ito gratings based on microstructured electrodes. By properly selecting only four voltage sources, we modulate the LC-induced phase profile such that non-diffractive Bessel beams, laser stretching, beam steering, and 2D tunable diffraction gratings are generated. In such a way, the proposed Lc-tunable component performs as an all-in-one device with unprecedented characteristics and multiple functionalities. the operation voltages are very low and the aperture is large. Moreover, the device operates with a very simple voltage control scheme and it is lightweight and compact. Apart from the demonstrated functionalities, the proposed technique could open further venues of research in optical phase spatial modulation formats based on electro-optical materials.

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Section: Introductionmentioning

confidence: 99%

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Algorri

Morawiak

Zografopoulos

et al. 2020

Sci Rep

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“…These methods of increasing w GRIN can often be combined to create further optimized hybrid devices [62,[76][77][78][79]. Several reviews of such techniques for lensing applications have been published [9,74,80].…”

Section: Lensesmentioning

confidence: 99%

Liquid Crystal Devices for Beam Steering Applications

2021

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Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented. The paper introduces the properties of liquid crystals that have made them useful in this field followed by a more detailed discussion of specific liquid crystal devices that act as switchable optical components of refractive and diffractive types. The relative advantages and disadvantages of the different devices and techniques are summarised.

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“…V c is the control voltage (applied on the hole patterned electrode); R 1 and C 1 , are the equivalent electric resistance and capacitance of the LC cell, respectively; R 2 , is the equivalent resistance of the high-resistivity layer; C 2 , the equivalent capacitance due to the floating electrode. Reprinted with permission from [153]. Copyright 2016 Optical Society of America.…”

Section: Modal Controlmentioning

confidence: 99%

Liquid Crystal Optical Device

Bennis¹,

Jaroszewicz²

2020

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Polarization is a very useful parameter of a light beam in many optical measurements. Improvement of holographic systems requires optical elements which need a diffused and depolarized light beam. This paper describes a simple monochromatic depolarizer based on a pure vertically aligned liquid crystal without pretilt. In this work we present an extended description of depolarizer by analyzing its electro-optic properties measured in spatial and time domains with the use of crossed polarizers and polarimetric configurations. Crossed polarizers setup provides information on spatial and temporal changes of microscopic textures while polarimetric measurement allows to measure voltage and time dependence of degree of polarization. Three different thicknesses, i.e., 5 μm, 10 μm and 15 μm have been manufactured in order to analyze another degree of freedom for this type of depolarizer device based on a liquid crystals' material. Consideration of the light scattering capability of the cell is reported.

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High optical quality electrically variable liquid crystal lens using an additional floating electrode

Cited by 46 publications

References 13 publications

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Multifunctional light beam control device by stimuli-responsive liquid crystal micro-grating structures

Liquid Crystal Devices for Beam Steering Applications

Liquid Crystal Optical Device

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