A droplet manipulation on a liquid crystal and polymer composite film as a concentrator and a sun tracker for a concentrating photovoltaic system

Tsou, Yu Shih; Chang, Kai; Lin, Yi‐Hsin

doi:10.1063/1.4812391

Cited by 18 publications

(8 citation statements)

References 26 publications

(26 reference statements)

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“…In the case of holographic projection systems, a LC lens can also help to correct the mismatch of the chromatic image size which is very important for a full-color holographic projection system [ 43 ]. Liquid crystal lenses can also be used as concentrators and a sun trackers in concentrating photovoltaic (CPV) systems [ 44 ].…”

Section: Liquid Crystal Microlenses For Autostereoscopic Displaysmentioning

confidence: 99%

Liquid Crystal Microlenses for Autostereoscopic Displays

et al. 2016

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Three-dimensional vision has acquired great importance in the audiovisual industry in the past ten years. Despite this, the first generation of autostereoscopic displays failed to generate enough consumer excitement. Some reasons are little 3D content and performance issues. For this reason, an exponential increase in three-dimensional vision research has occurred in the last few years. In this review, a study of the historical impact of the most important technologies has been performed. This study is carried out in terms of research manuscripts per year. The results reveal that research on spatial multiplexing technique is increasing considerably and today is the most studied. For this reason, the state of the art of this technique is presented. The use of microlenses seems to be the most successful method to obtain autostereoscopic vision. When they are fabricated with liquid crystal materials, extended capabilities are produced. Among the numerous techniques for manufacturing liquid crystal microlenses, this review covers the most viable designs for its use in autostereoscopic displays. For this reason, some of the most important topologies and their relation with autostereoscopic displays are presented. Finally, the challenges in some recent applications, such as portable devices, and the future of three-dimensional displays based on liquid crystal microlenses are outlined.

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Section: Liquid Crystal Microlenses For Autostereoscopic Displaysmentioning

confidence: 99%

Liquid Crystal Microlenses for Autostereoscopic Displays

et al. 2016

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“…Besides ophthalmic lens, the LC lenses have many applications, such as the imaging systems of portable devices, pico-projection systems, holographic projection systems, solar cells, ophthalmic lenses for myopia/presbyopia and endoscopic systems [33,[46][47][48][49][50][51]. In the imaging system, LC lenses can help to realize autofocusing system and optical zoom system for the portable devices, such as cell phones and cameras [46].…”

Section: Ophthalmic Lenses Using Nematic Liquid Crystalsmentioning

confidence: 99%

“…As to the endoscopic system, a LC lens can be adopted to electrically enlarge the depth-of-field of the endoscopic system [50]. LC lenses can also be used as a concentrator and a sun tracker in a concentrating photovoltaic (CPV) system to stabilize the output power of CPV system [48,51]. An active eyewear device is a future trend.…”

Section: Ophthalmic Lenses Using Nematic Liquid Crystalsmentioning

confidence: 99%

Liquid Crystals for Bio-medical Applications

Lin

2014

Topics in Applied Physics

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Thermotropic nematic LCs can modulate light in phases, amplitudes, and polarizations [1]. Many photonic applications based LCs have developed, such as displays, electro-optical switches, lenses, optical vortex generators, variable optical attenuations, solar cells and so on. Thermotropic nematic LCs have great potential in bio-medical applications. In this session, we mainly introduce two the bio-medical applications based on thermotropic nematic LCs: biosensors and ophthalmic lenses. In biosensors, the key is interfacial interactions between biosamples and LC molecules. We will introduce a LC and polymer complex system, the LC and polymer composite film (LCPCF), whose surface free energy is electrically switchable. LCPCF can help to test the sperm quality and high-density-lipoprotein (HDL). In ophthalmic applications, we will introduce the challenges and requirements for design of ophthalmic lenses. A polarizer-free LC lens with large aperture size is also introduced. Biosensors Using Nematic Liquid CrystalsIn general, interfacial interactions between LCs and bio-samples (or sensing targets) are the key to design a biosensor using nematic LCs [2][3][4][5][6][7]. Such an interfacial interaction often causes the re-orientations of LC molecules at the interface. As a result, optical properties of LC change and the change of the orientation of LC can be read out by observing under a polarizing microscopy. LC can optically amplify the biological binding events and help us to study the biology. The main approach is to immobilize thermotropic nematic LC onto a solid surface as a sensing interface for bio-samples. 5CB is a commonly used a LC material for biosensing. In the literatures, 5CB has been proved for sensing many bio-samples,

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“…The study [ 17 ] did not investigate the liquid-liquid interface curvature with varying device parameters such as voltage, dielectric properties, etc. In most of the electrowetting device studies for beam steering applications, such as in [ 4 , 17 , 18 , 19 , 20 ], the shape of the electrowetting cell is rectangular, which can facilitate only single-axis tracking of the sun. The proposed design of [ 4 ] suggests two layers of liquid prism array directs the light to the Fresnel lens, which concentrates the light over a CPV cell.…”

Section: Introductionmentioning

confidence: 99%

A Novel Hexagonal Beam Steering Electrowetting Device for Solar Energy Concentration

2020

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Traditional tracking devices for solar energy applications have several disadvantages, such as bulky mechanical structure, large wind loads, and ease of misalignment. This study aims to design a flat, thin, and adaptive beam steering device to eliminate these drawbacks. A proof of concept device was fabricated to demonstrate this design. The novelty of the proof of concept device is the hexagonal structure of the electrowetting cell design. The hexagonal cell was dosed with two immiscible liquids with different refractive indices. The hypothesis of this design is that by deforming the liquid shape with the application of voltage, light can be steered and concentrated for solar energy applications. A maximum contact angle change of 44° was observed with the application of 26 V to one of the electrodes of the hexagonal cell. The device demonstrated a 4.5° change of laser beam path with only a 0.2 refractive index difference of the liquids. The 3D simulation model developed in this study shows that a tilted and flat interface can be achieved using higher dielectric constant dielectric materials. The device can facilitate the planer steering and concentration of sunlight for rooftop applications without moving mechanical parts.

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A droplet manipulation on a liquid crystal and polymer composite film as a concentrator and a sun tracker for a concentrating photovoltaic system

Cited by 18 publications

References 26 publications

Liquid Crystal Microlenses for Autostereoscopic Displays

Liquid Crystal Microlenses for Autostereoscopic Displays

Liquid Crystals for Bio-medical Applications

A Novel Hexagonal Beam Steering Electrowetting Device for Solar Energy Concentration

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