Voltage-programmable liquid optical interface
Voltage-programmable liquid optical interface
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DOI：
10.1038/nphoton.2009.99
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发表时间：
2009-07-01
期刊：
影响因子：
35
通讯作者：
McHale, G.
中科院分区：
文献类型：
--
作者：
Brown, C. V.;Wells, G. G.;McHale, G.
最近，人们对基于微流体的光子器件产生了浓厚的兴趣，包括显示器（1,2）和使用电润湿原理工作的折射率可调微透镜和光学光束导向器（3-5）（6,7）。在这里，我们报告了一种用于光学器件的新方法，其中由于介电泳力的作用，在油薄膜表面产生静态皱纹（8-10）。我们已经在节距长度在20到240 μ m之间，响应时间小于40 μ s的周期性器件中展示了这种电压可编程的表面起皱效应。通过仔细选择油，可以优化微米级节距的高振幅正弦起皱，也可以优化更复杂的非正弦剖面，在更长的节距下具有更高的傅里叶分量。这开辟了开发快速响应电压可编程，偏振不敏感的透射和反射衍射器件以及任意表面轮廓光学器件的可能性。
Recently, there has been intense interest in photonic devices based on microfluidics, including displays(1,2) and refractive tunable microlenses and optical beamsteerers(3-5) that work using the principle of electrowetting(6,7). Here, we report a novel approach to optical devices in which static wrinkles are produced at the surface of a thin film of oil as a result of dielectrophoretic forces(8-10). We have demonstrated this voltage-programmable surface wrinkling effect in periodic devices with pitch lengths of between 20 and 240 mu m and with response times of less than 40 mu s. By a careful choice of oils, it is possible to optimize either for high-amplitude sinusoidal wrinkles at micrometre-scale pitches or more complex non-sinusoidal profiles with higher Fourier components at longer pitches. This opens up the possibility of developing rapidly responsive voltage-programmable, polarization-insensitive transmission and reflection diffraction devices and arbitrary surface profile optical devices.