Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission
Graphene has been recently proposed as a promising alternative to support surface plasmons with its superior performances in terahertz and mid-infrared range. Here, we propose a graphene-coated elliptical nanowire (GCENW) structure for subwavelength terahertz waveguiding. The mode properties and the...
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MDPI AG
2019-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/9/11/2351 |
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| author | Da Teng Kai Wang Zhe Li Yongzhe Zhao Gao Zhao Huiyong Li Heng Wang |
| author_facet | Da Teng Kai Wang Zhe Li Yongzhe Zhao Gao Zhao Huiyong Li Heng Wang |
| author_sort | Da Teng |
| collection | DOAJ |
| description | Graphene has been recently proposed as a promising alternative to support surface plasmons with its superior performances in terahertz and mid-infrared range. Here, we propose a graphene-coated elliptical nanowire (GCENW) structure for subwavelength terahertz waveguiding. The mode properties and their dependence on frequency, nanowire size, permittivity and chemical potential of graphene are studied in detail by using a finite element method, they are also compared with the graphene-coated circular nanowires (GCCNWs). Results showed that the ratio of the long and short axes (<i>b</i>/<i>a</i>) of the elliptical nanowire had significant influence on mode properties, they also showed that a propagation length over 200 μm and a normalized mode area of approximately 10<sup>−4</sup>~10<sup>−3</sup> could be obtained. Increasing <i>b</i>/<i>a</i> could simultaneously achieve both long propagation length and very small full width at half maximum (FWHM) of the focal spots. When <i>b</i>/<i>a</i> = 10, a pair of focal spots about 40 nm could be obtained. Results also showed that the GCENW had a better waveguiding performance when compared with the corresponding GCCNWs. The manipulation of Terahertz (THz) waves at a subwavelength scale using graphene plasmon (GP) may lead to applications in tunable THz components, imaging, and nanophotonics. |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-11T09:29:14Z |
| publishDate | 2019-06-01 |
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| series | Applied Sciences |
| spelling | doaj.art-059611f2763d4df093604d9fea1a8e9c2022-12-22T01:13:03ZengMDPI AGApplied Sciences2076-34172019-06-01911235110.3390/app9112351app9112351Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz TransmissionDa Teng0Kai Wang1Zhe Li2Yongzhe Zhao3Gao Zhao4Huiyong Li5Heng Wang6School of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, ChinaKey Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaDepartment of Physics, Shanghai University, 99 Shangda Road, Baoshan District, Shanghai 200444, ChinaSchool of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, ChinaSchool of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, ChinaSchool of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, ChinaSchool of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, ChinaGraphene has been recently proposed as a promising alternative to support surface plasmons with its superior performances in terahertz and mid-infrared range. Here, we propose a graphene-coated elliptical nanowire (GCENW) structure for subwavelength terahertz waveguiding. The mode properties and their dependence on frequency, nanowire size, permittivity and chemical potential of graphene are studied in detail by using a finite element method, they are also compared with the graphene-coated circular nanowires (GCCNWs). Results showed that the ratio of the long and short axes (<i>b</i>/<i>a</i>) of the elliptical nanowire had significant influence on mode properties, they also showed that a propagation length over 200 μm and a normalized mode area of approximately 10<sup>−4</sup>~10<sup>−3</sup> could be obtained. Increasing <i>b</i>/<i>a</i> could simultaneously achieve both long propagation length and very small full width at half maximum (FWHM) of the focal spots. When <i>b</i>/<i>a</i> = 10, a pair of focal spots about 40 nm could be obtained. Results also showed that the GCENW had a better waveguiding performance when compared with the corresponding GCCNWs. The manipulation of Terahertz (THz) waves at a subwavelength scale using graphene plasmon (GP) may lead to applications in tunable THz components, imaging, and nanophotonics.https://www.mdpi.com/2076-3417/9/11/2351Terahertz wavegraphene plasmonsubwavelength structurenanophotonics |
| spellingShingle | Da Teng Kai Wang Zhe Li Yongzhe Zhao Gao Zhao Huiyong Li Heng Wang Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission Applied Sciences Terahertz wave graphene plasmon subwavelength structure nanophotonics |
| title | Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission |
| title_full | Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission |
| title_fullStr | Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission |
| title_full_unstemmed | Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission |
| title_short | Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission |
| title_sort | graphene coated elliptical nanowires for low loss subwavelength terahertz transmission |
| topic | Terahertz wave graphene plasmon subwavelength structure nanophotonics |
| url | https://www.mdpi.com/2076-3417/9/11/2351 |
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