摘要
为了使频率选择超表面获得新的共振模式,在全介质共振单元内部引入了狭缝,利用狭缝对电磁场的局域特性设计了基于该种共振单元的频率选择超表面。模拟其传输特性后发现,当狭缝的长边和入射电场方向相同时,可以在低频处出现一个阻带,电磁场主要分布在共振单元之间。当狭缝的长边和入射电场方向垂直时,可以在高频处出现一个阻带和一个通带,同时随着共振频率的增大,电磁场的局域特性更加明显,被更好地限制在狭缝内部。通过调整狭缝的宽度、数量和间距可以在比较大的频率范围内调整超表面的工作频段。同时,也可以通过旋转改变狭缝和入射电场的相对位置,实现该频率选择超表面的可重构。这些理论结果为以狭缝为基础设计更复杂结构的共振单元提供了重要的理论指导。
In order to obtain new resonance modes for frequency selection of the metasurface,one or two slits were introduced into the all-dielectric resonance unit,all-dielectric frequency selective metasurface based on this type resonance unit was designed by using the local characteristics of electromagnetic field by slit.After simulating its transmission characteristics,it was found that when the long side of the slit and the direction of the incident electric field were the same,a stop band could appear at the low frequency,and the electromagnetic field was mainly distributed between the resonance units.When the long side of the slit was perpendicular to the direction of the incident electric field,a stopband and a passband could appear at the high frequency.Meanwhile,with the increase of the resonance frequency,the local characteristics of the electromagnetic field were more obvious and were better limited within the slit.By adjusting the width,number and spacing of slits,the operating frequency of the metasurface could be adjusted in a large frequency range.At the same time,the relative position of the slit and incident electric field could be changed by rotation to realize the reconfiguration of the metasurface.These theoretical results provide important theoretical guidance for the design of more complex resonant units based on slit.
作者
孙海竹
张建心
樊心民
孙永志
李森森
Sun Haizhu;Zhang Jianxin;Fan Xinmin;Sun Yongzhi;Li Sensen(School of Physics and Optoelectronic Engineering,Weifang University,Weifang 261061,China;Institute of New Electromagnetic Materials,Weifang University,Weifang 261061,China;Science and Technology on Electro-Optical Information Security Control Laboratory,Tianjin 300308,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2020年第S01期83-89,共7页
Infrared and Laser Engineering
基金
国家自然科学基金(61701349)
山东省高校科研计划(J18KB110)
关键词
频率选择超表面
全介质
狭缝型共振单元
frequency selective metasurface
all-dielectric
slotted resonance unit
