Highly Efficient Anisotropic Chiral Plasmonic Metamaterials for Polarization Conversion and Detection
Highly Efficient Anisotropic Chiral Plasmonic Metamaterials for Polarization Conversion and Detection
复制标题
用于偏振转换和探测的高效各向异性手征等离子体超材料
DOI：
10.1021/acsnano.1c02278
复制
发表时间：
2021-08-12
期刊：
影响因子：
17.1
通讯作者：
Yao, Yu
中科院分区：
文献类型：
--
作者：
Bai, Jing;Yao, Yu
等离子体手性超材料在光通信、生物医学诊断、偏振成像和圆二色光谱等方面具有潜在的应用前景，引起了广泛的研究兴趣。然而，等离子体结构中的光学损耗严重限制了实际应用。本文提出了具有强手性的高效亚波长厚度等离子体手性超材料的设计概念和实验证明。所提出的设计利用等离子体超表面来控制光的相位和偏振，并利用各向异性薄膜干涉效应来增强光学手性，同时最小化光学损耗。基于这样的设计理念，我们实验展示了光学器件，如传输效率高达90%，消光比bbb180的圆偏振滤波器，转换效率高达90%的偏振转换器，以及片上集成微滤波器阵列，用于在宽波长范围（3.5-5 μ m）内高精度的全斯托克斯偏振检测。通过结构工程，提出的设计概念适用于从近红外到太赫兹区域。
Plasmonic chiral metamaterials have attracted broad research interest because of their potential applications in optical communication, biomedical diagnosis, polarization imaging, and circular dichroism spectroscopy. However, optical losses in plasmonic structures severely limit practical applications. Here, we present the design concept and experimental demonstration for highly efficient subwavelength-thick plasmonic chiral metamaterials with strong chirality. The proposed designs utilize plasmonic metasurfaces to control the phase and polarization of light and exploit anisotropic thin-film interference effects to enhance optical chirality while minimizing optical loss. Based on such design concepts, we demonstrated experimentally optical devices such as circular polarization filters with transmission efficiency up to 90% and extinction ratio >180, polarization converters with conversion efficiency up to 90%, as well as on-chip integrated microfilter arrays for full Stokes polarization detection with high accuracy over a broad wavelength range (3.5-5 mu m). The proposed design concepts are applicable from near-infrared to Terahertz regions via structural engineering.