Enhanced Response Time of Electrowetting Lenses with Shaped Input Voltage Functions.
Enhanced Response Time of Electrowetting Lenses with Shaped Input Voltage Functions.
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DOI：
10.1021/acs.langmuir.7b00631
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
O. Supekar;M. Zohrabi;J. Gopinath;V. Bright
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文献类型：
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作者：
O. Supekar;M. Zohrabi;J. Gopinath;V. Bright
基于电润湿原理的自适应光学透镜在显微镜、遥感、显示器和光通信等领域得到了广泛的应用。为了表征这些电润湿透镜的响应，在低粘度液体系统中研究了对直流（DC）驱动电压函数的依赖性。圆柱形透镜的内径为2.45和3.95毫米被用来表征直流电压电润湿驱动下的液体的动态行为。随着输入指数驱动电压的上升时间的增加，原始欠阻尼的系统响应可以被阻尼，使得能够实现来自透镜的平滑响应。我们通过实验确定了透镜最快响应的最佳上升时间。我们还进行了数值模拟的透镜致动与输入指数驱动电压，以了解各种输入上升时间的液-液界面的动态变化。我们通过对具有多个指数上升时间的输入电压函数进行整形，进一步提高了器件的响应时间。对于3.95 mm内径的透镜，与使用单指数驱动电压获得的最快响应相比，我们实现了29%的响应时间改进。该技术显示了巨大的前景，需要快速响应时间的应用程序。
Adaptive optical lenses based on the electrowetting principle are being rapidly implemented in many applications, such as microscopy, remote sensing, displays, and optical communication. To characterize the response of these electrowetting lenses, the dependence upon direct current (DC) driving voltage functions was investigated in a low-viscosity liquid system. Cylindrical lenses with inner diameters of 2.45 and 3.95 mm were used to characterize the dynamic behavior of the liquids under DC voltage electrowetting actuation. With the increase of the rise time of the input exponential driving voltage, the originally underdamped system response can be damped, enabling a smooth response from the lens. We experimentally determined the optimal rise times for the fastest response from the lenses. We have also performed numerical simulations of the lens actuation with input exponential driving voltage to understand the variation in the dynamics of the liquid-liquid interface with various input rise times. We further enhanced the response time of the devices by shaping the input voltage function with multiple exponential rise times. For the 3.95 mm inner diameter lens, we achieved a response time improvement of 29% when compared to the fastest response obtained using single-exponential driving voltage. The technique shows great promise for applications that require fast response times.