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Open AccessArticle

High-Performance Transmission of Surface Plasmons in Graphene-Covered Nanowire Pairs with Substrate

1
School of Physics and Electronical Engineering, Zhengzhou Normal University, Zhengzhou 450044, China
2
Key Laboratory of Infrared Imaging Materials and Detectors, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
3
School of Chemistry and Chemical Engineering, Zhengzhou Normal University, Zhengzhou 450044, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(11), 1594; https://doi.org/10.3390/nano9111594 (registering DOI)
Received: 14 October 2019 / Revised: 2 November 2019 / Accepted: 7 November 2019 / Published: 10 November 2019
(This article belongs to the Special Issue Advances in Photonic and Plasmonic Nanomaterials)
Graphene was recently proposed as a promising alternative to support surface plasmons with superior performances in the mid-infrared range. Here, we theoretically show that high-performance and low-loss transmission of graphene plasmons can be achieved by adding a silica substrate to the graphene-covered nanowire pairs. The effect of the substrate layer on mode properties has been intensively investigated by using the finite element method. Furthermore, the results show that inserting a low index material layer between the nanowire and substrate could compensate for the loss accompanied by the substrate, thus the mode properties could be adjusted to fulfill better performance. A reasonable propagation length of 15 μm and an ultra-small normalized mode area about ~10−4 could be obtained at 30 THz. The introduction of the substrate layer is crucial for practical fabrication, which provides additional freedom to tune the mode properties. The graphene-covered nanowire pairs with an extra substrate may inspire potential applications in tunable integrated nanophotonic devices. View Full-Text
Keywords: graphene plasmons; subwavelength structures; mid-infrared waves; waveguide graphene plasmons; subwavelength structures; mid-infrared waves; waveguide
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MDPI and ACS Style

Teng, D.; Wang, K.; Huan, Q.; Zhao, Y.; Tang, Y. High-Performance Transmission of Surface Plasmons in Graphene-Covered Nanowire Pairs with Substrate. Nanomaterials 2019, 9, 1594.

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