Highly tunable plasmon-induced transparency with Dirac semimetal metamaterials  

作　　者：Chunzhen Fan Peiwen Ren Yuanlin Jia Shuangmei Zhu Junqiao Wang 范春珍;任佩雯;贾渊琳;朱双美;王俊俏(School of Physics and Microstructures,Zhengzhou University,Zhengzhou 450001,China;College of Science,Henan University of Engineering,Zhengzhou 450001,China)

机构地区：[1]School of Physics and Microstructures,Zhengzhou University,Zhengzhou 450001,China [2]College of Science,Henan University of Engineering,Zhengzhou 450001,China

出　　处：《Chinese Physics B》2021年第9期377-383,共7页中国物理B（英文版）

基　　金：Project supported by the Natural Science Foundation of Henan Provincial Educational Committee,China(Grant No.21A140026).

摘　　要：Based on Dirac semimetal metamaterials,the tunable plasmon induced transparency(PIT)is investigated elaborately in this work.The designed unit cell consists of a strip and a square bracket,which is periodically aligned on the dielectric substrate.Our numerical results illustrate that a pronounced transparency window exists due to near field coupling between two bright modes,which can be dynamically tuned with Fermi energy.Namely,the transparency window demonstrates a distinct blue shift with a larger Fermi energy.Moreover,an on-to-off switch of the PIT transparency window is realized with different polarization angles.In addition,the accompanied slow light property is examined with the calculation of phase and group delay.Finally,a small variation of the refractive index of the substrate can induce a clear movement of the PIT transparency window which delivers a guidance in the application of optical sensing.Thus,this work provides us a new strategy to design compact and adjustable PIT devices and has potential applications in highly tunable optical switchers,sensors,and slow light devices.

关 键 词：plasmon-induced transparency Dirac semimetal metamaterials optical switch slow light 

分 类 号：O469[理学—凝聚态物理]