Feng Yuyi, Leiderer Paul, Zhao Ruizhe, Xiao Xiaofei, Giannini Vincenzo, Maier Stefan A, Nemitz Clayton A, Lin Zemeng, Ding Ning, Kang Guoguo, Cheng Dewen, Schmidt-Mende Lukas, Huang Lingling, Wang Yongtian
Opt Express. 2020 Sep 28;28(20):29513-29528. doi: 10.1364/OE.403437.
Plasmonic metamaterials enable extraordinary manipulation of key constitutive properties of light at a subwavelength scale and thus have attracted significant interest. Here, we report a simple and convenient nanofabrication method for a novel meta-device by glancing deposition of gold into anodic aluminum oxide templates on glass substrates. A methodology with the assistance of ellipsometric measurements to examine the anisotropy and optical activity properties is presented. A tunable polarization conversion in both transmission and reflection is demonstrated. Specifically, giant broadband circular dichroism for reflection at visible wavelengths is experimentally realized by oblique incidence, due to the extrinsic chirality resulting from the mutual orientation of the metamaterials and the incident beam. This work paves the way for practical applications for large-area, low-cost polarization modulators, polarization imaging, displays, and bio-sensing.
表面等离激元超材料能够在亚波长尺度上对光的关键本构特性进行非凡操控，因此引起了广泛关注。在此，我们报告一种通过将金掠射到玻璃基板上的阳极氧化铝模板中来制备新型超材料器件的简单便捷的纳米制造方法。提出了一种借助椭偏测量来研究各向异性和光学活性特性的方法。展示了在透射和反射中均可调谐的偏振转换。具体而言，由于超材料与入射光束的相互取向导致的外在手性，通过斜入射在实验上实现了可见光波长下反射的巨大宽带圆二色性。这项工作为大面积、低成本偏振调制器、偏振成像、显示器和生物传感的实际应用铺平了道路。
