Next Article in Journal
A Coordinated Dual-Channel Wide Area Damping Control Strategy for a Doubly-Fed Induction Generator Used for Suppressing Inter-Area Oscillation
Next Article in Special Issue
The UV Plasmonic Behavior of Rhodium Tetrahedrons—A Numerical Analysis
Previous Article in Journal
A Novel Focal Length Measurement Method for Center-Obstructed Omni-Directional Reflective Optical Systems
Previous Article in Special Issue
Refractive Index Sensing of Monolayer Molecules Using Both Local and Propagating Surface Plasmons in Mid-Infrared Metagrating
Open AccessArticle

Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission

by Da Teng 1,2,*, Kai Wang 3,*, Zhe Li 4, Yongzhe Zhao 1, Gao Zhao 1, Huiyong Li 1 and Heng Wang 1
1
School of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, China
2
Quantum Materials Research Center, School of Physics and Electronic Engineering, Zhengzhou Normal University, Zhengzhou 450044, China
3
Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
4
Department of Physics, Shanghai University, 99 Shangda Road, Baoshan District, Shanghai 200444, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(11), 2351; https://doi.org/10.3390/app9112351
Received: 3 May 2019 / Revised: 24 May 2019 / Accepted: 3 June 2019 / Published: 8 June 2019
(This article belongs to the Special Issue Design and Applications of Plasmonic Materials)
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 (b/a) 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 10−4~10−3 could be obtained. Increasing b/a could simultaneously achieve both long propagation length and very small full width at half maximum (FWHM) of the focal spots. When b/a = 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. View Full-Text
Keywords: Terahertz wave; graphene plasmon; subwavelength structure; nanophotonics Terahertz wave; graphene plasmon; subwavelength structure; nanophotonics
Show Figures

Figure 1

MDPI and ACS Style

Teng, D.; Wang, K.; Li, Z.; Zhao, Y.; Zhao, G.; Li, H.; Wang, H. Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission. Appl. Sci. 2019, 9, 2351.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop