Tunable Metamaterial with Gold and Graphene Split-Ring Resonators and Plasmonically Induced Transparency.

Qichang Ma,Youwei Zhan,Weiyi Hong

doi:10.3390/nano9010007

Abstract

In this paper, we propose a metamaterial structure for realizing the electromagnetically induced transparency effect in the MIR region, which consists of a gold split-ring and a graphene split-ring. The simulated results indicate that a single tunable transparency window can be realized in the structure due to the hybridization between the two rings. The transparency window can be tuned individually by the coupling distance and/or the Fermi level of the graphene split-ring via electrostatic gating. These results could find significant applications in nanoscale light control and functional devices operating such as sensors and modulators.

Highlights

Electromagnetically-induced transparency (EIT) is a concept originally observed in atomic physics and arises due to quantum interference, resulting in a narrowband transparency window for light propagating through an originally opaque medium [1,2]
We propose a periodic metamaterial structure which is composed of a graphene split-ring and a gold split-ring to investigate the EIT effect in the MIR
The top layer is composed of gold split-ring and graphene split ring while the middle layer plays a role as a substrate and its material is Al2 O3 and the graphene split-ring is composed of 5 layers of graphene in our following simulations so as to enhance the modulation depth [41]

Summary

Introduction

Electromagnetically-induced transparency (EIT) is a concept originally observed in atomic physics and arises due to quantum interference, resulting in a narrowband transparency window for light propagating through an originally opaque medium [1,2]. The EIT effect extended to classical optical systems using plasmonic metamaterials leads to new opportunities for many important applications such as slow light modulator [3,4,5,6], high sensitivity sensors [7,8], quantum information processors [9], and plasmonic switches [10,11,12]. Graphene is a two-dimensional material which is composed of single layer of carbon atoms, which has been widely used in optoelectronic devices, such as optical modulators [28,29,30] due to its unique properties such as high electron mobility [31], high light transparency [32] and high thermal conductivity [33]. Graphene is widely used in metamaterial to achieve a variety of optoelectronic devices with tunable properties [36,37,38]

Methods

Results

Conclusion