Area-tunable micromirror based on electrowetting actuation of liquid-metal droplets

Wan, Zhiliang; Zeng, Hongjun; Feinerman, Alan

doi:10.1063/1.2388943

Cited by 46 publications

(34 citation statements)

References 16 publications

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“…The material used for insulator has direct effect in asymmetric electrowetting. Parylene has been widely used both in fundamental studies 23,24 and device applications 13,25 of electrowetting. It was reported that while using Parylene as the insulator, the change in contact angle was independent of the polarity.…”

Section: Principle and Fundamental Studies Sessile Drop Experimentsmentioning

confidence: 99%

Asymmetric electrowetting—moving droplets by a square wave

et al. 2007

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Here droplet oscillation and continuous pumping are demonstrated by asymmetric electrowetting on an open surface with embedded electrodes powered by a square wave electrical signal without control circuits. The polarity effect of electrowetting on an SU-8 and Teflon coated electrode is investigated, and it is found that the h-V (contact angle-applied voltage) curve is asymmetric along the V = 0 axis by sessile drop and coplanar electrode experiments. A systematic deviation of measured contact angles from the theoretical ones is observed when the electrode beneath the droplet is negatively biased. In the sessile drop experiment, up to a 10u increment of contact angle is measured on a negatively biased electrode. In addition, a coplanar electrode experiment is designed to examine the contact angles at the same applied potential but opposite polarities on two sides of one droplet at the same time. The design of the coplanar electrodes is then expanded to oscillate and transport droplets on square-wave-powered symmetric (square) and asymmetric (polygon) electrodes to demonstrate manipulation capability on an open surface. The frequency of oscillation and the speed of transportation are determined by the frequency of the applied square wave and the pitch of the electrodes. Droplets with different volumes are tested by square waves of varied frequencies and amplitudes. The 1.0 ml droplet is successfully transported on a device with a loop of 24 electrodes continuously at a speed up to 23.6 mm s 21 when a 9 Hz square wave is applied.

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Section: Principle and Fundamental Studies Sessile Drop Experimentsmentioning

confidence: 99%

Asymmetric electrowetting—moving droplets by a square wave

et al. 2007

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“…EWOD, which is a powerful means to control the electrolyte at micro scale, can change the contact angle and the shape of electrolyte droplet through the electric driving mechanism at the liquid–solid interface. At micro scale, the liquid cohesion and the electrically affected surface tension are dominant, effectively driving the droplet to form convex lens . For an EWOD driven liquid lens, firstly discussed by Peseux and Berge , the voltage applied to the dielectric layer would generate an electrostatic field to change the energy exerted on the liquid–solid interface, and thus reduce the contact angle and change the profile of the electrolyte droplet with electrodes placed at a certain distance from the liquid–solid interface.…”

Section: Adaptive Liquid Lens By Different Methodsmentioning

confidence: 99%

Actuation of adaptive liquid microlens droplet in microfluidic devices: A review

Zhu

Yao

et al. 2018

Electrophoresis

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A significant growth of research on adaptive liquid lens is achieved over the past decades, and the field is still attracting increasing attentions, focusing on the transition from the current stage to the commercialized stage. The challenges faced are not limited to fabrication, material, small tuning range in focal lengths, additional control systems, limitations in special actuation methods and so on. In addition, the use of external driving parts or systems induce extra problem on bulky appearance, high cost, low reliability etc. Therefore, adaptive liquid lens will be an interesting research focus in both microfluidics and optofluidics science. This review attempts to summarize and focus on the droplet profile deformation under different driving mechanisms in tunable liquid microlens as well as the application in cameras, cell phone and so on. The driving techniques are generally categorized in terms of mechanisms and driving sources.

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“…Another work related to the control of a boundary profile is the electrowetting-driven area tunable micro mirror (Wan et al 2006), demonstrating optofluidic tunability via modifying the shape of a liquid-gas boundary (a planoconvex mercury droplet and air, Fig. 5).…”

Section: Geometric Tunabilitymentioning

confidence: 99%

Tunable optofluidic devices

Levy

Shamai

2007

Microfluid Nanofluid

116

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The emerging field of optofluidics provides exciting opportunities for the realization of tunable optofluidic devices (TODs) using a large variety of physical mechanisms. This is because microfluidics is a promising technology for achieving a high degree of tunability-a capability that is not available in many of the current optical devices. In addition, microfluidics holds a great potential for rapid prototyping, miniaturization and integration. TODs already find commercial applications in various fields such as display and imaging, and are expected to become a key player in future optical systems for biology, medicine, communication and information processing. We review the recent progress in the field and discuss potential future directions.

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Area-tunable micromirror based on electrowetting actuation of liquid-metal droplets

Abstract: Design, simulation, fabrication, packaging, and characterization of a MEMS-based mirror array for femtosecond pulse-shaping in phase and amplitude Rev. Sci. Instrum. 82, 075106 (2011); 10.1063/1.3606440Actuation of water droplets driven by an organic transistor based inverter

Cited by 46 publications

References 16 publications

Asymmetric electrowetting—moving droplets by a square wave

Asymmetric electrowetting—moving droplets by a square wave

Actuation of adaptive liquid microlens droplet in microfluidic devices: A review

Tunable optofluidic devices

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