光学学报, 2020, 40 (6): 0623002, 网络出版: 2020-03-06
用于中红外波深度亚波长传输的石墨烯间隙等离激元波导 下载: 1255次
Graphene Gap Plasmonic Waveguide for Deep-Subwavelength Transmission of Mid-Infrared Waves
光学器件 波导 表面等离激元 红外波 亚波长结构 optical devices waveguides surface plasmons infrared wave subwavelength structures
摘要
提出一种由石墨烯包裹的纳米线和石墨烯层构成的石墨烯间隙波导结构,并采用有限元方法对基模传输特性及其与结构参数、材料参数等的关系进行了详细研究。结果表明:纳米线半径、间隙距离、纳米线介电常数和石墨烯化学势均对模式传输特性有很大影响。通过优化参数,这种结构可以同时实现石墨烯等离激元的长距离传输和模场的深度亚波长约束。采用石墨烯等离激元实现中红外波的深亚波长传输为突破衍射极限光子器件的设计及高密度集成提供了理论基础和指导。
Abstract
This paper proposes a graphene gap waveguide structure comprising graphene-covered nanowires and graphene layers. The propagating properties of the fundamental mode and their dependence on the structural and material parameters are studied in detail by the finite element method. Results show that the nanowire radius, gap distance, nanowire permittivity, and chemical potential of graphene have a significant impact on the mode transmission properties. By optimizing parameters, the proposed structure can simultaneously achieve long-range propagation of graphene plasmons and deep subwavelength confinement of the mode field. The application of graphene plasmons for the deep-subwavelength transmission of mid-infrared waves offers a theoretical basis and guidance for the design and high-density integration of photonic devices beyond the diffraction limit.
滕达, 王凯, 李哲, 曹清, 唐亚楠, 赵永哲, 刘子怡, 张韵雯, 郭荣珍. 用于中红外波深度亚波长传输的石墨烯间隙等离激元波导[J]. 光学学报, 2020, 40(6): 0623002. Da Teng, Kai Wang, Zhe Li, Qing Cao, Yanan Tang, Yongzhe Zhao, Ziyi Liu, Yunwen Zhang, Rongzhen Guo. Graphene Gap Plasmonic Waveguide for Deep-Subwavelength Transmission of Mid-Infrared Waves[J]. Acta Optica Sinica, 2020, 40(6): 0623002.