多功能超表面的光传输特性研究进展

Progress in Optical Transmission Characteristics of Multi-functional Metasurfaces

电磁集成技术在现代科学技术中发挥着核心作用,被认为是解决电磁设备日益增长的数据存储容量需求和信息处理速度需求的关键。其难点在于如何有效地将多种多样的功能集成在一个具有亚波长结构的器件中。诸多光子器件,如偏振分束器、平板聚焦透镜等已经被自然材料或者近年提出的超材料实现。但是由于这些材料具有较大的厚度,不便于光子器件的集成,使它们的应用大大受限。作为平面二维结构的超表面由于具有独特的电磁响应特性和强大的电磁波操控能力,已经在多功能器件设计领域得到了应用。本文从多功能超表面设计的理论出发,介绍了其研究背景并总结了近年来的研究进展,将其分为基于纯透射设计的、基于纯反射设计的以及基于反射、透射设计的三类多功能超表面。最后对未来多功能超表面的设计方向提出了展望。

Electromagnetic integration technology plays a central role in modern science and technology because it is considered to be the key to address the growing demand for data storage capacity and information processing speed for electromagnetic devices.The difficulty lies in how to effectively integrate a wide variety of functions into a device with a sub-wavelength structure.Many photonic devices,such as polarizing beam splitters,flat focusing lenses,etc.,have been implemented by natural materials or metamaterials proposed in recent years.However,due to the large thickness of these materials,it is inconvenient to integrate photonic devices,which greatly limits their application.The metasurface,as a planar two-dimensional structure,with unique electromagnetic response characteristics and powerful ability to manipulate electromagnetic waves,has been used in the field of multi-function device design.Based on the theory of multi-functional metasurface design,this paper introduces its research background and summarizes the research progress in recent years.It is divided into three types that are based on pure transmission design,based on pure reflection design and based on reflection and transmission design.Finally,the future design direction of multi-functional metasurface is suggested.