Harnessing Evanescent Waves by Bianisotropic Metasurfaces
Harnessing Evanescent Waves by Bianisotropic Metasurfaces
复制标题
DOI：
10.1002/lpor.201900244
复制
发表时间：
2020-09-13
影响因子：
11
通讯作者：
Liu, Yongmin
中科院分区：
文献类型：
--
作者：
Li, Lin;Yao, Kan;Liu, Yongmin
倏逝波呈指数衰减的特性，使得捕捉、提取和设计它们所能携带的丰富能量和信息变得困难。利用双各向异性c孔径超表面产生的面外电偶极子和面内磁偶极子，可以有效地模制倏逝波。更具体地说，证明了c孔纳米结构的取向可以控制倏逝波发射的相位、偏振态或光束分布。这项工作为超表面在关键的近场区域有效地利用倏逝波开辟了一条新的途径，并承诺了许多潜在的应用，包括片上自由电子光源、桌面粒子探测器和近场能量收集。
The exponentially decaying nature of evanescent waves renders it difficult to capture, extract and engineer the wealth of energy and information that they can carry. Utilizing the out-of-plane electric dipoles and in-plane magnetic diploes produced by a bianisotropic C-aperture metasurface, in this work, it is shown that evanescent waves can be effectively molded. More specifically, it is demonstrated that the phase, polarization state or beam profile of the emission from evanescent waves can be controlled via the orientation of C-aperture nanostructures. The work opens a new avenue for metasurfaces to work in the critical near-field region to efficiently harness evanescent waves, and promises many potential applications, including on-chip free-electron light sources, tabletop particle detectors and near-field energy harvesting.