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Open AccessArticle

Tunable-Focus Liquid Lens through Charge Injection

Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Author to whom correspondence should be addressed.
Micromachines 2020, 11(1), 109;
Received: 25 December 2019 / Revised: 7 January 2020 / Accepted: 12 January 2020 / Published: 20 January 2020
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics, Volume III)
Liquid lenses are the simplest and cheapest optical lenses, and various studies have been conducted to develop tunable-focus liquid lenses. In this study, a simple and easily implemented method for achieving tunable-focus liquid lenses was proposed and experimentally validated. In this method, charges induced by a corona discharge in the air were injected into dielectric liquid, resulting in “electropressure” at the interface between the air and the liquid. Through a 3D-printed U-tube structure, a tunable-focus liquid lens was fabricated and tested. Depending on the voltage, the focus of the liquid lens can be adjusted in large ranges (−∞ to −9 mm and 13.11 mm to ∞). The results will inspire various new liquid-lens applications. View Full-Text
Keywords: tunable focus; liquid lens; electrohydrodynamics; charge injection tunable focus; liquid lens; electrohydrodynamics; charge injection
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MDPI and ACS Style

Qian, S.; Shi, W.; Zheng, H.; Liu, Z. Tunable-Focus Liquid Lens through Charge Injection. Micromachines 2020, 11, 109.

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