Full-parameter omnidirectional transformation optical devices  

作　　者：Yuan Gao Yu Luo Jingjing Zhang Zhengjie Huang Bin Zheng Hongsheng Chen Dexin Ye 

机构地区：[1]Interdisciplinary Center for Quantum Information,State Key Laboratory of Extreme Photonics and Instrumentation,ZJU-Hangzhou Global Scientific and Technological Innovation Center,Zhejiang University,Hangzhou 310027,China [2]School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore 639798,Singapore [3]CNRS-International-NTU-Thales Research Alliance,Nanyang Technological University,Singapore 637553,Singapore [4]Institute of Electromagnetic Space,Southeast University,Nanjing 210096,China [5]State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China [6]International Joint Innovation Center,The Electromagnetics Academy at Zhejiang University,Zhejiang University,Haining 314400,China [7]Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang,Jinhua Institute of Zhejiang University,Zhejiang University,Jinhua 321099,China [8]Shaoxing Institute of Zhejiang University,Zhejiang University,Shaoxing 312000,China

出　　处：《National Science Review》2024年第3期86-93,共8页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(62122068,62071420,61871127 and 61975176);funding support from Singapore Ministry of Education(MOE2018-T2-2-189(S));A*Star AME IRG Grant(A20E5c0095);Programmatic Funds(A18A7b0058);National Research Foundation Singapore Competitive Research Program(NRF-CRP22-2019-0006 and NRF-CRP23-2019-0007);sponsored by the Key Research and Development Program of the Ministry of Science and Technology(2022YFA1404704 and 2022YFA1405200 to H.C.);the Fundamental Research Funds for the Central Universities.

摘　　要：Transformation optics(TO)provides an unprecedented technique to control electromagnetic(EM)waves by engineering the constitutive parameters of the surrounding medium through a proper spatial transformation.In general,ideal transformation optical devices require simultaneous electric and magnetic responses along all three dimensions.To ease the practical implementation,previous studies usually made use of reduced parameters or other simplified approaches,which inevitably introduce extra reflection or unwanted phase shift.Up to today,experimental realizations of full-parameter transformation optical devices in free space are still quite limited.Here,a general design strategy is proposed to solve this problem.As a specific example,a full-parameter spatial-compression TO medium with constitutive parameters taking the diagonal form diag(a,a,1/a)for the TM wave incidence was designed and realized experimentally.Such spatial-compression TO media were then applied to the implementation of an ideal omnidirectional invisibility cloak capable of concealing a large-scale object over a wide range of illumination angles.Both the simulation and experiment confirm that the cloak allows for nearly unity transmission of EM waves in the forward direction without introducing extra scattering or phase shift.This work constitutes an important stepping stone for future practical implementation of arbitrary full-parameter omnidirectional transformation optical devices.

关 键 词：transformation optical devices omnidirectional impedance matching full-parameter invisibility cloak 

分 类 号：TN873[电子电信—信息与通信工程]