John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
Sci Rep. 2018 May 8;8(1):7240. doi: 10.1038/s41598-018-25675-3.
We present here a compact metasurface lens element that enables simultaneous and spatially separated imaging of light of opposite circular polarization states. The design overcomes a limitation of previous chiral lenses reliant on the traditional geometric phase approach by allowing for independent focusing of both circular polarizations without a 50% efficiency trade-off. We demonstrate circular polarization-dependent imaging at visible wavelengths with polarization contrast greater than 20dB and efficiencies as high as 70%.
我们在这里展示了一种紧凑的超表面透镜元件，它能够同时实现相反圆偏振态光的空间分离成像。该设计克服了以前依赖传统几何相位方法的手性透镜的局限性，允许在不牺牲 50%效率的情况下，对两种圆偏振光进行独立聚焦。我们在可见光波长下演示了圆偏振相关成像，偏振对比度大于 20dB，效率高达 70%。
