School of Electrical and Computer Engineering, RMIT University, Melbourne, Australia.
Lab Chip. 2015 Feb 21;15(4):1092-100. doi: 10.1039/c4lc01213e.
Switchability is a highly sought after feature for planar optical systems. Suspensions of nanomaterials can be used for generating controllable changes in such systems. We report a planar diffractive microfluidic lens which integrates controlled dielectrophoresis (DEP) for trapping suspended nanomaterials. Silicon and tungsten oxide nanoparticle suspensions are used. These nanomaterials are trapped in such a way as to form alternating opaque and transparent rings using the DEP forces on demand. These rings form a planar diffractive Fresnel zone plate to focus the incident light. The Fresnel zone plate is tuned for the visible light region and the lens can be turned on (DEP applied) or off (DEP removed) in a controlled manner. This proof of concept demonstration can be further expanded for a variety of switchable optical devices and can be integrated with lab-on-a-chip and optofluidic devices.
可切换性是平面光学系统的一个备受追捧的特性。纳米材料的悬浮液可用于产生此类系统中可控的变化。我们报告了一种平面衍射微流控透镜，它集成了受控的电介质电泳（DEP）来捕获悬浮的纳米材料。使用了硅和氧化钨纳米颗粒悬浮液。这些纳米材料被按需捕获，形成交替的不透明和透明环，使用DEP 力。这些环形成平面衍射菲涅耳波带片以聚焦入射光。菲涅耳波带片针对可见光区域进行了调谐，透镜可以以可控的方式打开（施加 DEP）或关闭（去除 DEP）。这种概念验证演示可以进一步扩展到各种可切换的光学设备，并可以与芯片实验室和光电设备集成。
