Novel resistive electrode structure for liquid crystal modal lens shifting

Fraval, Nicolas; Berier, Frédéric; Castany, Olivier

doi:10.1117/12.909233

Cited by 5 publications

(3 citation statements)

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“…Due to the combined effect of the resistivity of the layer and the capacitance of the LC layer, the uniform weakly conductive layer leads to a spatially varying effective voltage profile. Such a weakly conducting layer approach can be used for tunable lens applications [11][12][13][14] but also for beam steering devices. 15,16 The sheet resistance of weakly conductive layers is an important parameter in the design of several types of devices.…”

Section: Introductionmentioning

confidence: 99%

Optimization of liquid crystal devices based on weakly conductive layers for lensing and beam steering

Beeckman

Nys

Willekens

et al. 2017

Journal of Applied Physics

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Liquid crystals are mostly known for their use in displays, but over the past decade these materials have been applied in a number of other devices such as tunable lenses or beam steering devices. A common technique to realize a gradual electric field profile as is required to obtain a gradual refractive index profile in these applications is the use of weakly conductive materials. The weakly conductive layers are able to spread the voltage profile which is applied through well-conductive electrodes at the side of the weakly conductive layer. The simulation and design of such structures is not trivial because two or three dimensional quasi-static electric field profiles need to be calculated. This is due to the fact that the resistivity of the conductive layers and the dielectric properties of the liquid crystal are coupled. An exact solution requires solving a number of coupled differential equations. In this paper, we develop a model to simulate the RC-effects with an approximate model

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Section: Introductionmentioning

confidence: 99%

Optimization of liquid crystal devices based on weakly conductive layers for lensing and beam steering

Beeckman

Nys

Willekens

et al. 2017

Journal of Applied Physics

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“…As a result, the focal length of the LC lens device can be flexibly modulated by the operating voltage. To date, various approaches have been developed to achieve tunable LC lenses, such as a surfacerelief profile [1], shaped electrode [2][3][4], Fresnel zone type [5,6], elastomeric molds [7], vertically aligned multiwall carbon nanofiber electrodes [8], droplet evaporation [9], polymer network LC technique [10,11], and self-assembly of liquid crystal or polymer [12,13]. Although several approaches to fabricating microlenses have been reported, these methods are technically complicated and expensive.…”

Section: Introductionmentioning

confidence: 99%

Liquid Crystal Microlens Using Nanoparticle‐Induced Vertical Alignment

Hwang

Shieh²,

Lin³

2015

Journal of Nanomaterials

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The nanoparticle-induced vertical alignment (NIVA) of the nematic liquid crystals (LC) is applied to achieve an adaptive flat LC microlens with hybrid-aligned nematic (HAN) mode by dropping polyhedral oligomeric silsesquioxane (POSS) nanoparticle solution on a homogeneous alignment layer. The vertical alignment induced by the POSS nanoparticles resulted in the formation of a hybrid-aligned LC layer with concentric nonuniform distribution of the refractive index in the planar LC cell, which subsequently played the role of the lens, even in the absence of any applied voltages. The dimensions of the concentric HAN structure significantly depend on the volume of the microdroplet and the POSS concentration. The focus effect of this flat microlens was observed while electrically controlling its focal length using the applied voltages from −50 mm to −90 mm.

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“…Besides, the function of HRL is to assist the electric field distributing all over the aperture and thus to lower the driving voltage. [14][15] The potential distribution (U) across the aperture of a simple hole-patterned structure can be expressed as: 2…”

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confidence: 99%

Large aperture and polarizer-free liquid crystal lenses for ophthalmic applications

Lin¹,

Chen

Chang

et al. 2014

SPIE Proceedings

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Large aperture and polarizer-free liquid crystal lenses (LC lenses) based on a double-layered structure for ophthalmic applications are demonstrated. The polarizer-free LC lens functions as both of a positive lens and a negative lens with large aperture size of 10mm. The lens power is electrically and continuously tunable ranging from -1.32Diopter to 1.83 Diopter. To demonstrate the polarization independency, the wavefronts of the LC lenses under different polarized light were measured and discussed. The detail operations of the applied voltage and frequency are also discussed. The imaging performance of the LC lens is also evaluated. This study provide a detail understanding of the polarizer-free LC lenses based on a double-layered structure.

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Novel resistive electrode structure for liquid crystal modal lens shifting

Cited by 5 publications

References 0 publications

Optimization of liquid crystal devices based on weakly conductive layers for lensing and beam steering

Optimization of liquid crystal devices based on weakly conductive layers for lensing and beam steering

Liquid Crystal Microlens Using Nanoparticle‐Induced Vertical Alignment

Large aperture and polarizer-free liquid crystal lenses for ophthalmic applications

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