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Open AccessArticle

Tunable-Focus Liquid Lens through Charge Injection

1
Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA
2
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
3
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; https://doi.org/10.3390/mi11010109
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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