A new negative liquid crystal lens with multiple ring electrodes in unequal widths

Chao, Paul C.-P.; Kao, Yung Yuan; Hsu, Chin-Yuan

doi:10.1109/jphot.2012.2183583

Cited by 27 publications

(9 citation statements)

References 30 publications

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“…The corresponding free energy density is,

where constant term f 0 is omitted and where K 1 and K 3 are the Frank elastic constants for splay and bend deformation, respectively [ 48 , 49 ]. In accordance with our experimental studies, which are performed with the conventional liquid crystalline mixture E7 doped with the barium hexaferrite nanoplatelets, we took in our calculations K 1 = 11 pN, K 3 = 14.5 pN [ 34 , 50 ], M 0 = 200 A/m and γ = 70 [ 34 ]. The Equation (2) was used to calculate the orientational profile of the ferromagnetic LC between two polymer (SU-8) ribbons via numerical minimization of the free energy by using the Wolfram Mathematica.…”

Section: Orientational Profile Of the Liquid Crystalline Mediummentioning

confidence: 99%

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

2020

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We present a theoretical analysis of optical diffractive properties of magnetically tunable optical transmission gratings composed of periodically assembled layers of a polymer and a ferromagnetic liquid crystal (LC). The orientational structure of the LC layers as a function of an applied magnetic field is calculated by minimization of the Landau-de Gennes free energy for ferromagnetic LCs, which is performed numerically and also analytically by using the one-constant approximation and the approximations of the high and the low magnetic fields. Optical diffractive properties of the associated diffraction structure are calculated numerically in the framework of rigorous coupled-wave analysis (RCWA). The presented methodology provides a basis for designing new types of diffractive optical element based on ferromagnetic LCs and simulating their operation governed by the in-plane magnetic field.

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“…The corresponding free energy density is,

Section: Orientational Profile Of the Liquid Crystalline Mediummentioning

confidence: 99%

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

2020

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“…1(a). It is important to note that such hybrid structures requires low-driven voltage input, which can be considered another superiority of the proposed device [24]. The phase of each LCs' unit cell for varying radius and LCs' rotation angle is calculated via finite difference time domain (FDTD) analyses.…”

Section: Methodsmentioning

confidence: 99%

Tunable metasurfaces with nematic liquid crystals

et al. 2018

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Intensive researches in the area of metasurfaces have provided a new insight to obtain flat and compact optical systems. In this letter, we numerically show that, highly efficient tunable beam steering effect in transmission mode is achieved at wavelength λ = 550 nm using nematic liquid crystals (LCs) infiltrated into double sided metasurfaces. Using the electrooptical feature of LCs, the phase profile of the metasurfaces is controlled and thus, the transmitted beam is deflected within the range from -15˚ to 15˚ steering angles. Transparent dielectric materials are used in the designed structure that provides highly efficient beam-steering; the corresponding transmission efficiency is above 83% in the visible spectrum, which is another superiority of the proposed hybrid tunable structure over present plasmonic/metamaterial approaches. The designed metasurface still preserves its beam deflection property covering the visible spectrum and hence, such hybrid structure can be implemented for broadband electro-optically controllable beam steering applications.

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“…A straightforward solution for realizing the LC-GRIN profile is to use multiple addressing electrodes that are individually driven. The GRIN profile is then directly determined by the electric field profile [23][24][25][26]. Good optical performance of the LC beam shaping device requires accurate and fine control of this electric field distribution.…”

Section: Optical Beam Shaping Using Lc Gradient Refractive Indexmentioning

confidence: 99%

Active Optical Beam Shaping Based on Liquid Crystals and Polymer Micro-Structures

et al. 2020

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Emerging applications requiring light beam manipulation, such as high-efficiency sunlight concentrators for solar cells, switchable micro-lens arrays for autostereoscopic displays, tunable lenses for augmented reality goggles, auto-focusing spectacles, and smart contact lenses, mostly depend on one or more active optical components with the desired and controllable beam modifying functionalities, preferably manufactured at relatively low cost. Recent progress in research on components based on the combination of liquid crystals (LCs) and various polymer micro-structures is reviewed in this paper. It is found that such components can address the demands appropriately and have the potential of paving the way for large-scale applications of active optical beam shaping components.

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A new negative liquid crystal lens with multiple ring electrodes in unequal widths

Cited by 27 publications

References 30 publications

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

Tunable metasurfaces with nematic liquid crystals

Active Optical Beam Shaping Based on Liquid Crystals and Polymer Micro-Structures

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