Negative refraction of ultra-squeezed in-plane hyperbolic designer polaritons  

作　　者：QIAOLU CHEN YIHAO YANG LI ZHANG JIALIN CHEN MIN LI XIAO LIN RUJIANG LI ZUOJIA WANG BAILE ZHANG HONGSHENG CHEN 

机构地区：[1]Interdisciplinary Center for Quantum Information,State Key Laboratory of Modern Optical Instrumentation,ZJU-Hangzhou Global Scientific and Technological Innovation Center,Zhejiang University,Hangzhou 310027,China [2]International Joint Innovation Center,Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang,The Electromagnetics Academy at Zhejiang University,Zhejiang University,Haining 314400,China [3]Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore 637371,Singapore [4]Centre for Disruptive Photonic Technologies,The Photonics Institute,Nanyang Technological University,Singapore 639798,Singapore

出　　处：《Photonics Research》2021年第8期1540-1549,共10页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(61625502,61975176,11961141010);Top-Notch Young Talents Program of China;Fundamental Research Funds for the Central Universities;Ministry of Education-Singapore(MOE2015-T2-1-070,MOE2016-T3-1-006,MOE2018-T2-1-022(S);Tier 1 RG174/16(S))。

摘　　要：The in-plane negative refraction of high-momentum(i.e.,high-k)photonic modes could enable many applications such as imaging,focusing,and waveguiding in a planar platform at deep-subwavelength scales.However,its practical implementation in experiments remains elusive so far.Here we propose a class of hyperbolic metasurfaces,which is characterized by an anisotropic magnetic sheet conductivity and can support the in-plane ultrahigh-k magnetic designer polaritons.Based on such metasurfaces,we report the experimental observation of the all-angle negative refraction of designer polaritons at extremely deep-subwavelength scales.Moreover,we directly visualize the designer polaritons with hyperbolic dispersions.Importantly,for these hyperbolic polaritons,we find that their squeezing factor is ultra-large.To be specific,it can be up to 129 in the experiments,an ultra-high value exceeding those in naturally hyperbolic materials.This work may pave a way toward exploring the extremely high confinement and unusual propagation of magnetic designer polaritons over monolayer or twisted bilayer hyperbolic metasurfaces.

关 键 词：HYPERBOLIC REFRACTION polar 

分 类 号：TB34[一般工业技术—材料科学与工程]