Mode characteristics of nested eccentric waveguides constructed by two cylindrical nanowires coated with graphene
Ji Liu(刘吉)1,†, Lixia Yu(于丽霞)2, and Wenrui Xue(薛文瑞)3
1 Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education, North University of China, Taiyuan 030051, China; 2 School of Information and Communication Engineering, North University of China, Taiyuan 030051, China; 3 College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
Abstract A kind of nested eccentric waveguide constructed with two cylindrical nanowires coated with graphene was designed. The mode characteristics of this waveguide were studied using the multipole method. It was found that the three lowest modes (mode 0, mode 1 and mode 2) can be combined by the zero-order mode or/and the first-order modes of two single nanowires. Mode 0 has a higher figure of merit and the best performance among these modes within the parameter range of interest. The mode characteristics can be adjusted by changing the parameters of the waveguide. For example, the propagation length will be increased when the operating wavelength, the minimum spacing between the inner and outer cylinders, the inner cylinder radius and the Fermi energy are increased. However, when the outer cylinder radius, the dielectric constants of region I, or the dielectric constants of region III are increased, the opposite effect can be seen. These results are consistent with the results obtained using the finite element method (FEM). The waveguide structure designed in this paper is easy to fabricate and can be applied to the field of micro/nano sensing.
Fund: Project supported by the Natural Science Foundation of Shanxi Province, China (Grant Nos. 201901D111159 and 2021D20021310) and the Shanxi Scholarship Council of China (Grant No. HGKY2019068).
Corresponding Authors:
Ji Liu
E-mail: liuji6@nuc.edu.cn
Cite this article:
Ji Liu(刘吉), Lixia Yu(于丽霞), and Wenrui Xue(薛文瑞) Mode characteristics of nested eccentric waveguides constructed by two cylindrical nanowires coated with graphene 2022 Chin. Phys. B 31 036803
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