Kilaru Murali K, Yang Jia, Heikenfeld Jason
Novel Devices Laboratory, Dept. of Elec. & Comp. Engineering, University of Cincinnati, Cincinnati, Ohio 45220, USA.
Opt Express. 2009 Sep 28;17(20):17563-9. doi: 10.1364/OE.17.017563.
Electrowetting retroreflectors use a simple and scalable construction, and incorporate an electrically tunable liquid lenslet. By electrically modulating the lenslet geometry, the reflection is switched between retroreflection and scattering. In this paper, we report new capability and characterization, including higher index liquids and contrast ratio as a function of contact angle (theta(V)). The reflected intensity is also spatially profiled and reported as a function of view angle. A high contrast ratio of >16X is demonstrated, and methods for further improving performance are discussed. Because the electrowetting retroreflector platform is broad spectrum (VIS-IR), the electrowetting retroreflector may be useful for a large variety of naked eye applications such as safety markings, road-signage, or friend-foe-identification.
电润湿后向反射器采用简单且可扩展的结构，并集成了电可调液体微透镜。通过对微透镜几何形状进行电调制，反射可在向后反射和散射之间切换。在本文中，我们报告了新的性能和特性，包括更高折射率的液体以及作为接触角（θ(V)）函数的对比度。还对反射强度进行了空间分布分析，并报告了其作为视角函数的情况。展示了大于16倍的高对比度，并讨论了进一步提高性能的方法。由于电润湿后向反射器平台具有宽光谱（可见光 - 红外）特性，电润湿后向反射器可用于多种肉眼可见的应用，如安全标识、道路标志或敌我识别。
