Large area and low power dielectrowetting optical shutter with local deterministic fluid film breakup

Zhao, Rui; Cumby, B.; Russell, A.; Heikenfeld, Jason

doi:10.1063/1.4834095

Cited by 28 publications

(42 citation statements)

References 31 publications

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“…The liquid crystal devices (LCDs) based on nematic LC have excellent light shutting characteristics and fast response time but the transmittance at light transmission state is very low due to optical loss from polarizer . The LCD utilizing dye‐doped cholesteric LC (chLC) and electrowetting devices have excellent optical properties and fast response time but too high driving voltage limits the application to portable devices like OST‐HMD . On the other hand, reported ECDs using various electrochromic materials have very low driving voltage suitable for the portable devices .…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

Kim

et al. 2018

Advanced Optical Materials

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In this paper, a high‐performance electrochromic optical shutter (ECOS) based on fluoran dye and an augmented reality (AR) display system comprising of ECOS are proposed. The electrochromic reactions of the fluoran dye that transmit or absorb visible light depending on its redox state are activated by the protons generated from hydroquinone derivatives, thereby significantly improved visible light absorption and decreased driving voltage. The visible light‐absorbing function of ECOS is a sole solution for overcoming the main issue of low visibility of displayed images under strong ambient light conditions in optical see‐through head‐mounted displays (OST‐HMDs) implementing augmented reality. The proposed AR display effectively solves the problem by significantly increasing the ambient contrast ratio and color gamut of the displayed image on OST‐HMD even in the strong ambient light condition due to the excellent visible light‐absorbing function of ECOS.

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Section: Resultsmentioning

confidence: 99%

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

Kim

et al. 2018

Advanced Optical Materials

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“…The authors also demonstrated a simple 1 × 6 color pixel array and the improvement in the contrast ratio of the pixels by changing the dye concentration; however, that resulted in a poor transmittance performance. Zhao et al demonstrated an optical shutter based on liquid film break-up by the dielectrowetting mechanism using interdigitated electrodes [68]. In the voltage off state, the optical shutter exhibited a very high light transmission of ~80%.…”

Section: Recent Applicationsmentioning

confidence: 99%

Wettability Manipulation by Interface-Localized Liquid Dielectrophoresis: Fundamentals and Applications

et al. 2019

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Electric field-based smart wetting manipulation is one of the extensively used techniques in modern surface science and engineering, especially in microfluidics and optofluidics applications. Liquid dielectrophoresis (LDEP) is a technique involving the manipulation of dielectric liquid motion via the polarization effect using a non-homogeneous electric field. The LDEP technique was mainly dedicated to the actuation of dielectric and aqueous liquids in microfluidics systems. Recently, a new concept called dielectrowetting was demonstrated by which the wettability of a dielectric liquid droplet can be reversibly manipulated via a highly localized LDEP force at the three-phase contact line of the droplet. Although dielectrowetting is principally very different from electrowetting on dielectrics (EWOD), it has the capability to spread a dielectric droplet into a thin liquid film with the application of sufficiently high voltage, overcoming the contact-angle saturation encountered in EWOD. The strength of dielectrowetting depends on the ratio of the penetration depth of the electric field inside the dielectric liquid and the difference between the dielectric constants of the liquid and its ambient medium. Since the introduction of the dielectrowetting technique, significant progress in the field encompassing various real-life applications was demonstrated in recent decades. In this paper, we review and discuss the governing forces and basic principles of LDEP, the mechanism of interface localization of LDEP for dielectrowetting, related phenomenon, and their recent applications, with an outlook on the future research.

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“…al. [ 3 ] have demonstrated a different technique utilising microfluidics for producing large area and electrically tunable optical shutters. They utilised the phenomenon of dielectro wetting to switch the fluid layer (on top of a hydrophobic fluoropolymer) into droplets allowing the passage of light.…”

Section: Introductionmentioning

confidence: 99%

Laser additive manufacturing of 3D meshes for optical applications

et al. 2018

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Selective laser melting (SLM) is a widely used additive manufacturing process that can be used for printing of intricate three dimensional (3D) metallic structures. Here we demonstrate the fabrication of titanium alloy Ti–6Al–4V alloy based 3D meshes with nodally-connected diamond like unit cells, with lattice spacing varying from 400 to 1000 microns. A Concept Laser M2 system equipped with laser that has a wavelength of 1075 nm, a constant beam spot size of 50μm and maximum power of 400W was used to manufacture the 3D meshes. These meshes act as optical shutters / directional transmitters and display interesting optical properties. A detailed optical characterisation was carried out and it was found that these structures can be optimised to act as scalable rotational shutters with high efficiencies and as angle selective transmission screens for protection against unwanted and dangerous radiations. The efficiency of fabricated lattice structures can be increased by enlarging the meshing size.

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Large area and low power dielectrowetting optical shutter with local deterministic fluid film breakup

Cited by 28 publications

References 31 publications

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

High‐Performance Electrochromic Optical Shutter Based on Fluoran Dye for Visibility Enhancement of Augmented Reality Display

Wettability Manipulation by Interface-Localized Liquid Dielectrophoresis: Fundamentals and Applications

Laser additive manufacturing of 3D meshes for optical applications

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