Graphene Gap Plasmonic Waveguide for Deep-Subwavelength Transmission of Mid-Infrared Waves

Da, 滕达 Teng; Kai, 王凯 Wang; Zhe, 李哲 Li; Qing, 曹清 Cao; Yanan, 唐亚楠 Tang; Yongzhe, 赵永哲 Zhao; Ziyi, 刘子怡 Liu; Yunwen, 张韵雯 Zhang; Rongzhen, 郭荣珍 Guo

doi:10.3788/aos202040.0623002

Cited by 2 publications

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“…Compared with the metallic waveguides, graphene plasmon waveguides could confine the infrared waves into the deep subwavelength scale, and the guided modes could be easily tuned [ 34 ]. Up to now, lots of graphene-based configurations have been proposed to guide the infrared waves, such as graphene ribbons [ 35 ], graphene slot waveguides [ 36 , 37 ], graphene wedge and groove waveguides [ 38 ], dielectric-loaded graphene waveguides [ 39 ], graphene-coated nanowires [ 40 , 41 , 42 , 43 , 44 , 45 , 46 ], graphene-based hybrid waveguides [ 47 , 48 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Teng

Wang

2021

Nanomaterials

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The waveguiding of terahertz surface plasmons by a GaAs strip-loaded graphene waveguide is investigated based on the effective-index method and the finite element method. Modal properties of the effective mode index, modal loss, and cut-off characteristics of higher order modes are investigated. By modulating the Fermi level, the modal properties of the fundamental mode could be adjusted. The accuracy of the effective-index method is verified by a comparison between the analytical results and numerical simulations. Besides the modal properties, the crosstalk between the adjacent waveguides, which determines the device integration density, is studied. The findings show that the effective-index method is highly valid for analyzing dielectric-loaded graphene plasmon waveguides in the terahertz region and may have potential applications in subwavelength tunable integrated photonic devices.

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Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Teng

Wang

2021

Nanomaterials

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Mode properties of elliptical dielectric waveguide with nested eccentric hollow cylinder coated with graphene

李慧慧¹,

薛文瑞²,

李宁³

et al. 2022

Acta Phys. Sin.

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An elliptical dielectric nanowire waveguide with a nested eccentric hollow cylinder is designed, the inner and outer surfaces of the waveguide are coated with graphene. The transmission characteristics of the three lowest order modes supported by the waveguide, that is the field distribution, the real part of the effective refractive index, the propagation length and the quality factor, are obtained by multipole method. The results show that the three lowest order modes of the waveguide can be synthesized by the lowest order modes supported by a single cylinder and an elliptic cylinder coated with graphene. With the increase of the radius of the embedded cylinder, the three evaluation indexes of the waveguide increase slightly; The change of the semi major axis of the ellipse will slightly increase the real part of the effective refractive index, propagation length and quality factor of Mode0 and Mode1, while Mode2 will slightly decrease. When a=b=170nm, the performance of the circular nested circular waveguide is slightly worse than that of the structure in this paper; With the decrease of the semi minor axis of the ellipse, the real part of the effective refractive index, propagation length and quality factor of the three modes increase to a certain extent, and have the greatest impact on Mode 1. When b=a=190nm, the transmission performance of the circular nested circular waveguide is not as good as that of the structure in this paper; When the distance between the inner and outer rods on the right increases, the real part of the effective refractive index of the three modes decreases, the propagation length and quality factor of Mode0 and Mode1 gradually decrease, while the propagation length of Mode2 increases slightly, and the quality factor is basically unchanged. On the contrary, the mode transmission performance can be significantly improved by increasing the working wavelength, Fermi energy and reducing the dielectric constant of elliptical dielectric nanowires. Compared with the circular dielectric nanowire waveguide nested with an eccentric hollow cylinder coated with graphene, it can be found that the waveguide designed in this paper has better transmission performance. These results have been verified by the finite element method. This waveguide can provide a theoretical basis for the design, fabrication and application of nested waveguides of the same type.

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Graphene Gap Plasmonic Waveguide for Deep-Subwavelength Transmission of Mid-Infrared Waves

Cited by 2 publications

References 0 publications

Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Mode properties of elliptical dielectric waveguide with nested eccentric hollow cylinder coated with graphene

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