An optofluidic lens serves as a highly reconfigurable device to manipulate light by using a smoothly curved interface between immiscible liquids. Here we propose a dielectro-optofluidic lens (DOL) that is capable of dual-mode reconfigurable focusing. In this DOL, light focuses through a dielectric liquid–aqueous liquid interface where movement and deformation of the interface are achieved by electrohydrodynamic (EHD) actuation. We initially perform alternating current-EHD actuation of the dielectric liquid to obtain its benefit of frequency-dependent behavior and to prevent electrolysis of the aqueous liquid. Our DOL uniquely operates in two modes, namely, an oscillation mode in the low-frequency regime (<1 Hz) with a 10 mm focus-tuning range and a static mode in the high-frequency regime (>10 Hz) with a 1 mm focus-tuning range, which are easily modulated on demand by the frequency range of the applied voltage. We successfully conduct proof-of-concept experiments, including extending the depth-of-field using the oscillation mode to clearly visualize thick targets, and integrating the proposed DOL with a photoacoustic microscope using the static mode to adjust the focal point.

中文翻译：

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使用水性液体和介电液体的界面进行双模式可重配置聚焦

光流体透镜通过在不混溶的液体之间使用平滑弯曲的界面来充当高度可重新配置的设备，以操纵光。在这里，我们提出了一种能够进行双模式可重配置聚焦的介电光透镜（DOL）。在该DOL中，光通过电介质-水-液体界面聚焦，该界面通过电动液力（EHD）致动实现运动和变形。我们首先对电介质液体进行交流电EHD致动，以获得其随频率变化的行为的好处，并防止水性液体的电解。我们的DOL独特地以两种模式运行，即聚焦模式调整范围为10 mm的低频模式（<1 Hz）的振荡模式和1的高频模式（> 10 Hz）的静态模式。 mm调焦范围，可以很容易地根据需要通过施加电压的频率范围进行调制。我们成功进行了概念验证实验，包括使用振荡模式扩展景深以清晰地可视化厚目标，以及将建议的DOL与使用静态模式调整焦点的光声显微镜集成在一起。