Miniaturized ultrasound scanner by electrowetting

Deladi, S.; Suijver, J. F.; Shi, Yongpeng; Shahzad, Khurram; Boer, B.M. de; Rademakers, A.J.J.M.; Vleuten, Cees van der; Jankovic, Ladislav; Bongers, Edwin; Harks, Erik; Kuiper, S.

doi:10.1063/1.3478455

“…The presence of the dielectric layer not only eliminates unwanted electrolysis, but also makes it possible to achieve a large switching angle. Owing to its low energy consumption, favorable scaling of the actuation force at the microscale as well as amenable integration with other systems, EWOD has also found promising applications in electronic display 20 21 22 , energy generation 23 , microelectromechanical (MEMS) 24 25 and microfluidic systems 26 27 28 29 .…”

mentioning

confidence: 99%

“…The presence of the dielectric layer not only eliminates unwanted electrolysis, but also makes it possible to achieve a large switching angle. Owing to its low energy consumption, favorable scaling of the actuation force at the microscale as well as amenable integration with other systems, EWOD has also found promising applications in electronic display [20][21][22] , energy generation 23 , microelectromechanical (MEMS) 24,25 and microfluidic systems [26][27][28][29] . Despite tremendous promise, the use of solid dielectric layer between the aqueous droplet and underlying electrode is associated with inevitable physical and chemical heterogeneities [30][31][32] , leading to limited functionalities.…”

mentioning

confidence: 99%

Electrowetting on liquid-infused film (EWOLF): Complete reversibility and controlled droplet oscillation suppression for fast optical imaging

Hao

¹

,

Liu

²

,

Chen

³

et al. 2014

Sci Rep

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Electrowetting on dielectric (EWOD) has emerged as a powerful tool to electrically manipulate tiny individual droplets in a controlled manner. Despite tremendous progress over the past two decades, current EWOD operating in ambient conditions has limited functionalities posing challenges for its applications, including electronic display, energy generation, and microfluidic systems. Here, we demonstrate a new paradigm of electrowetting on liquid-infused film (EWOLF) that allows for complete reversibility and tunable transient response simultaneously. We determine that these functionalities in EWOLF are attributed to its novel configuration, which allows for the formation of viscous liquid-liquid interfaces as well as additional wetting ridges, thereby suppressing the contact line pinning and severe droplet oscillation encountered in the conventional EWOD. Finally, by harnessing these functionalities demonstrated in EWOLF, we also explore its application as liquid lens for fast optical focusing.

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“…Electrowetting lenses have been demonstrated with high optical quality [3,4] and have been implemented in flexible films [5], endoscopes [6], and cameras [7]. Electrowetting prism arrays have a wide range of applications, including imaging displays [8][9][10][11][12][13], scanners [14], and solar tracking systems [15]. For other beam steering applications, single, stand-alone electrowetting prisms have been demonstrated with single-liquid [16], two-liquid [17,18], and three-liquid [15] configurations.…”

Section: Introductionmentioning

confidence: 99%