Actively tunable polarization-sensitive multiband absorber based on graphene  

作　　者：Ai-Li Cao Kun Zhang Jia-Rui Zhang Yan Liu Wei-Jin Kong 曹爱利;张昆;张佳瑞;刘燕;孔伟金(College of Physics Science,Center for Marine Observation and Communications,Qingdao University,Qingdao 266071,China)

机构地区：[1]College of Physics Science,Center for Marine Observation and Communications,Qingdao University,Qingdao 266071,China

出　　处：《Chinese Physics B》2020年第11期336-342,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11804178 and 11274188);the Natural Science Foundation of Shandong Province,China(Grant No.ZR2018BA027).

摘　　要：We design an actively tunable polarization-sensitive multiband absorber in the mid-infrared region,which consists of stacked graphene multilayers separated by dielectric layers on a metal mirror.Benefiting from the anisotropic structure,the absorber has dual absorption bands with almost perfect absorption at different wavelengths under the x and y polarizations.Analyzing the electric field amplitude distributions and the surface currents,we find that the absorption peaks under the same polarization are excited in the graphene layers independently.Therefore,more absorption bands can be achieved by increasing the graphene layers.Adjusting the Fermi energy of the graphene layers,the working wavelengths of the polarization-sensitive multiband absorbers can be tuned actively,and thus achieving a wide band regulation range.Besides,the peak number and the peak strength of the multiband absorber can be actively controlled by the polarization angle as well.We also propose a method to design an actively tunable polarization-sensitive multiband absorber,which may have potential applications in mid-infrared devices,such as polarization-sensitive filters and detectors.

关 键 词：multiband absorber polarization-sensitive GRAPHENE band regulation 

分 类 号：TB34[一般工业技术—材料科学与工程]