平坦等频面双曲超材料的奇特电磁传输性  

Novel Electromagnetic Propagation in Hyperbolic Metamaterials with Flat Iso-Frequency Planes

作　　者：刘艳红[1] 任咪娜 董丽娟[1] 苏晓强 石云龙[1] Liu Yanhong;Ren Mina;Dong Lijuan;Su Xiaoqiang;Shi Yunlong(Shanxi Province key Laboratory of Microstructure Electromagnetic Functional Materials,Shanxi Datong University,Datong,Shanxi 037009,China;Key Laboratory of Advanced Micro-Structure Materials,Ministry of Education,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]山西大同大学微结构电磁功能材料省市共建山西省重点实验室,山西大同037009 [2]同济大学物理科学与工程学院先进微结构材料教育部重点实验室,上海200092

出　　处：《光学学报》2022年第2期168-175,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11874245,61805129);山西省重点研发项目(201903D121071,201903D121026)。

摘　　要：电磁波在媒质中的传输行为与媒质等频线的形状密切相关。双曲超材料的等频面为开放的双曲面,它支持任意大波矢的传播,将通常环境中以倏逝波形式存在的电磁波大波矢分量转换为传播场,从而实现更多奇特的电磁传输性。基于双曲线型等频面超材料,通过调节等频线的形状,制备出兼具双曲超材料和零折射率材料的新型材料,该材料不仅可以支持大波矢实现高方向性单向传输,同时可以将任意角度入射的电磁波以零角度折射,从而实现亚波长聚焦和超分辨特性。利用微波实验验证了高方向性单向传输特性、亚波长聚焦和超分辨特性,该研究为双曲超材料的理论和应用研究提供了更多的可能性。The propagation behavior of an electromagnetic wave in a medium depends heavily on the shape of the iso-frequency contour of the medium. The iso-frequency plane of a hyperbolic metamaterial is an open hyperboloid that supports the propagation of any large wave vector. The large wave vector component of an electromagnetic wave manifested as an evanescent wave in a conventional environment can be converted into a propagation field to achieve more novel electromagnetic propagation effects. In this paper, on the basis of a metamaterial with a hyperbolic iso-frequency plane, a novel material that has the properties of both hyperbolic metamaterials and zero-refractive-index materials is prepared by adjusting the shape of the iso-frequency contour. It can not only support the highly directional and unidirectional propagation of the large wave vector, but also refract an any angle incident electromagnetic wave at a zero angle. Therefore, it can be used to achieve subwavelength focusing and super resolution. These effects, namely the highly directional and unidirectional propagation, subwavelength focusing, and super resolution, are verified experimentally in the microwave domain. This research offers more possibilities for the theoretical and application studies of hyperbolic metamaterials.

关 键 词：材料 双曲超材料 平坦等频面 单向传输 深亚波长聚焦 

分 类 号：O439[机械工程—光学工程]