Ultrawideband chromatic aberration-free meta-mirrors  

作　　者：Tong Cai Shiwei Tang Bin Zheng Guangming Wang Wenye Ji Chao Qian Zuojia Wang Erping Li Hongsheng Chena 

机构地区：[1]Zhejiang University,College of Information Science and Electronic Engineering,Interdisciplinary Center for Quantum Information,State Key Laboratory of Modern Optical Instrumentation,Hangzhou,China [2]Air Force Engineering University,Air and Missile Defend College,Xi’an,China [3]Zhejiang University,ZJU-Hangzhou Global Science and Technology Innovation Center,Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang,Hangzhou,China [4]Ningbo University,Department of Physics,Faculty of Science,Ningbo,China

出　　处：《Advanced Photonics》2021年第1期47-56,共10页先进光子学（英文）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant Nos.61871394,61901512,11604167,61625502,11961141010,61975176, 62071423;Postdoctoral Innovation Talents Support Program of China under Grant No.BX20190293, Natural Science Foundation of Shaanxi Province under Grant No.2019JQ-013.

摘　　要：Chromatic aberration-free meta-devices(e.g.,achromatic meta-devices and abnormal chromatic meta-devices)play an essential role in modern science and technology.However,current efforts suffer the issues of low efficiency,narrow operating band,and limited wavefront manipulation capability.We propose a general strategy to design chromatic aberration-free meta-devices with high-efficiency and ultrabroadband properties,which is realized by satisfying the key criteria of desirable phase dispersion and high reflection amplitudes at the target frequency interval.The phase dispersion is tuned successfully based on a multiresonant Lorentz model,and high reflection is guaranteed by the presence of the metallic ground.As proof of the concept,two microwave meta-devices are designed,fabricated,and experimentally characterized.An achromatic meta-mirror is proposed within 8 to 12 GHz,and another abnormal chromatic meta-mirror can tune the reflection angle as a linear function.Both meta-mirrors exhibit very high efficiencies(85%to 94%in the frequency band).Our findings open a door to realize chromatic aberration-free meta-devices with high efficiency and wideband properties and stimulate the realizations of chromatic aberration-free metadevices with other functionalities or working at higher frequency.

关 键 词：chromatic aberration-free meta-devices ultrabroadband metasurface phase and dispersion control multiresonant Lorentz model 

分 类 号：TN256[电子电信—物理电子学]