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Open AccessArticle

Tunable and Polarization-Independent Plasmon-Induced Transparency in a Fourfold Symmetric Metal-Graphene Terahertz Metamaterial

1
Department of Applied Physics, Xi’an University of Technology, Xi’an 710048, China
2
School of Automation, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(12), 632; https://doi.org/10.3390/cryst9120632
Received: 2 November 2019 / Revised: 22 November 2019 / Accepted: 25 November 2019 / Published: 28 November 2019
(This article belongs to the Special Issue 2D Materials: From Structures to Functions)
The introduction of graphene into metamaterials allows for more flexible and convenient control of electromagnetic waves. In this paper, one simple plasmon-induced transparency (PIT) structure with tunability and polarization independence is investigated in the terahertz (THz) regime. The simulation results indicate that the transparent window can be manipulated in a wide range and even switched off by merely changing the Fermi energy of graphene. By continuously altering the resonance intensity of the dark resonator using the graphene, the PIT resonance can be actively manipulated. The behavior can be elucidated by the classical coupled two-particle model, which corresponds well to the simulation results. Owing to the fourfold symmetric structure, the proposed PIT device exhibits polarization-independent characteristics. This work provides design guidance for metal-graphene THz modulators.
Keywords: graphene; metamaterial; plasmon-induced transparency; polarization-independent graphene; metamaterial; plasmon-induced transparency; polarization-independent
MDPI and ACS Style

Wang, G.; Zhang, X.; Wei, X.; Zhang, G. Tunable and Polarization-Independent Plasmon-Induced Transparency in a Fourfold Symmetric Metal-Graphene Terahertz Metamaterial. Crystals 2019, 9, 632.

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