气孔型石墨烯杂化等离激元波导  

Hole-based Graphene Hybrid Plasmonic Waveguide

作　　者：杨爽 贺雪晴 李鹏飞 YANG Shuang;HE Xue-qing;LI Peng-fei(Department of Physics,Taiyuan Normal University,Jinzhong 030619,China;Institute of Computational and Applied Physics,Taiyuan Normal University,Jinzhong 030619,China;College of Computer Science and Technology,Taiyuan Normal University,Jinzhong 030619,China)

机构地区：[1]太原师范学院物理系,山西晋中030619 [2]太原师范学院计算与应用物理研究所,山西晋中030619 [3]太原师范学院计算机科学与技术学院,山西晋中030619

出　　处：《量子光学学报》2024年第4期86-98,共13页Journal of Quantum Optics

基　　金：山西省基础研究计划(202203021222250,202303021211185);山西省高等学校科技创新项目(2021L401)。

摘　　要：本文提出了一种气孔型石墨烯—电介质杂化等离激元波导,利用电介质波导空芯结构所诱导的电介质模式与石墨烯等离激元耦合,产生了具有低损耗和强束缚性的杂化等离激元模式。通过改变间隙高度、空气孔大小和石墨烯化学势等,分析了杂化模式的模式特性和传输特性。相比较无空气孔杂化波导,该杂化波导具有强束缚性的同时具有较低损耗,其归一化模场面积可以缩小至2.77×10^(-4),这更加有助于光子的集成技术。此外还研究了两个杂化等离子体波导之间的串扰特性,将杂化波导之间无串扰中心距离的最小临界值缩小至22μm,进一步实现了超低串扰。Objective Surface plasmon Polariton(SPP)can bind the light field in a region far smaller than its free space wavelength,which is a technique that can break the diffraction limit and help to reduce the size of optical devices.Since SPP has obvious advantages at deep subwavelength scales,it is regarded as the key to manipulating optical signals at subwavelength scales.Terahertz(THz)waveguides are the basic components for the construction of various terahertz functional devices,which is of great significance for the realization of on-chip terahertz functional devices and ultra-wideband terahertz communication in the future.The surface conductivity of graphene is almost pure imaginary at the terahertz band,and it can exhibit properties similar to metal materials,so it can be regarded as a very thin metal layer,and the graphene plasmons also has low loss,strong confinement and tunability.However,in the terahertz band,although SPP has a long propagation length and low transmission loss, due to the difficult to adjust the properties of metal materials, its binding on the metal surface is still weak, so it is stilldifficult to achieve the effect of compact photon integration. A hole-based graphene hybrid plasmonic waveguide is proposed. Byadjusting the parameters and the chemical potential of graphene, the mode characteristics and transmission characteristics of thehybrid mode are studied numerically. Compared with the hybrid waveguide without air hole, the hybrid waveguide has strongbinding and low loss, which is more conducive to photon integration and achieves better transmission performance. In addition,the crosstalk characteristics between the two hybrid plasma waveguides are also studied to further achieve ultra-low crosstalk. Thelow crosstalk characteristics of this structure will have broad development prospects in future terahertz integrated circuits.Methods The characteristic patterns of the hole-based graphene hybrid plasmonic waveguide system with different structuralparameters and chemical potential of graph

关 键 词：石墨烯 表面等离激元 波导 串扰 

分 类 号：O436[机械工程—光学工程]