摘要
超表面是由亚波长结构组成的超薄人工表面,对电磁波具有突出的调控能力。近年来,因其在非线性效应增强方面的巨大潜力,超表面引起了人们越来越多的重视。具有现场可编程能力和时空信息调制能力的时空编码数字超表面可精准、高效地操控非线性电磁效应和电磁信息,因此成为非线性超表面的一种新模式。文章首先介绍时空编码数字超表面的基本概念,重点讨论近几年在非线性电磁调控方面的研究进展,包括谐波生成、电磁参数控制和非线性波前调控等相关工作。最后,对时空编码数字超表面面临的挑战及未来的发展趋势进行了总结和展望。
A metasurface is an ultrathin artificial surface,composed of sub-wavelength structures,which exhibits an extraordinary capability in controlling electromagnetic waves.It has attracted more and more interest owing to its huge potential in enhancing nonlinear effects.In recent years,space-time-coding digital metasurfaces with field programmable capabilities and spatiotemporally modulated electromagnetic parameters have been successfully used to manipulate nonlinear electromagnetic effects accurately and efficiently,and have thus become a new model of nonlinear metasurfaces.In this article,we first briefly outline the basic concepts of space-timecoding digital metasurfaces,and then review the recent research on nonlinear electromagnetic manipulation,including harmonic generation,electromagnetic parameter control,and nonlinear wavefront control.Finally,current challenges and future development prospects will be summarizeds.
作者
戴俊彦
崔铁军
DAI Jun-Yan;CUI Tie-Jun(State Key Laboratory of Millimeter Waves,Institute of Electromagnetic Space,Southeast University,Nanjing 210096,China;State Key Laboratory of Terahertz and Millimeter Waves,City University of Hong Kong,Hong Kong 999077,China)
出处
《物理》
CAS
北大核心
2021年第5期293-299,共7页
Physics
关键词
超表面
数字编码
时空编码
频率转换
非线性谐波调控
metasurfaces
digital coding
space-time-coding
frequency translation
nonlinear harmonic manipulation
作者简介
崔铁军,email:tjcui@seu.edu.cn。
