非互易石墨烯电磁特性机理研究

This project intends to study graphene’s electromagnetic non-reciprocity and design graphene-based miniature, tunable and broadband non-reciprocal devices. Under an external magnetic field, we plan to establish classical/quantum models to characterize graphene’s non-reciprocity. By systematically studying influences of the external magnetic field, substrate, doping density, and defects on graphene’s nonreciprocal parameters, we plan to macroscopically manipulate graphene’s non-reciprocity. To further provide valuable guidance for future novel non-reciprocal electromagnetic devices design, we will analyze the complicated non-reciprocal properties of graphene-based heterostructures, such as the composite structures constructed by graphene, grating, and traditional magnetic-optical materials. We will discuss some intricate physical processes, such as Cerenkov radiation or transition radiation, in graphene-based complicated nonreciprocal systems, in order to reveal some new physical properties and phenomena. We will also investigate the mechanism of realizing graphene’s non-reciprocity through simultaneously time-space modulation, instead of through applying an external magnetic fields. This project will develop analytical models for graphene-based nonreciprocal devices and their characterization methods, and realize ultrathin isolators for propagating or surface waves, unidirectional plasmonic excitations/propagation, and asymmetric scattering. We will carry out the preliminary experimental validation. The research methods and results obtained in this subject will play an important role in the development of 2D materials and electromagnetics.

本项目拟对石墨烯非互易电磁特性机理开展系列研究，基于石墨烯材料设计易于实现的小型化、可调控、宽频的非互易电磁器件。在外加磁场下，探讨石墨烯非互易电磁特性的经典/量子模型的建立，研究磁场、掺杂浓度、衬底、缺陷等对石墨烯非互易电磁参数的影响和宏观调控；分析磁光材料石墨烯-光栅和石墨烯-传统磁光材料等混合结构所具有的复杂的非互易电磁特性，从而为设计新型非互易电磁器件提供必要条件；分析契仑柯夫辐射和渡越辐射在石墨烯混合磁光结构中新物理现象；无外加磁场下，探讨通过时空调制实现石墨烯非互易电磁机理。研究石墨烯非互易电磁器件的解析模型、表征方法，实现光波/表面波的隔离器、单向激发/传输、非对称散射等，并能对非互易电磁器件性能进行初步实验验证。本课题获得的研究方法和成果将对石墨烯等二维材料领域和电磁领域的发展起到重要的促进作用。

非互易电磁器件在光通信系统、激光器、传感以及集成光学等技术领域都发挥着重要的作用。本项目核心内容是研究石墨烯非互易电磁特性机理，探索基于石墨烯等二维材料的小型化、可调控、宽频非互易电磁器件。本项目经过四年的努力，取得了重要的研究成果，超额地完成了项目的所有研究内容，达到了预期的研究目标。尤其是在石墨烯–氮化硼异质结构的电磁特性研究方面，本项目提出并获得了一种设计纳米超表面的通用方法，对于石墨烯等二维材料在电磁应用领域具有重要的科学意义。本项目4年内在国际知名杂志上发表高质量SCI论文50篇，其中有11篇文章在影响因子>10的期刊上发表，培养了博士后3名，博士研究生9名，硕士研究生4名，在读博士研究生14名，在读硕士研究生3名。