Tunable Electromagnetically Induced Transparency in Asymmetric Graphene-Based Metamaterial at Terahertz Region

Abstract

We theoretically investigate the active control of electromagnetic induced transparency (EIT) in a terahertz graphene-based metamaterial, whose unit cell structure is composed two perpendicularly connected graphene cut-wires. The theoretical investigations and field distributions reveal that the EIT window arises from the destructive interference caused by asymmetric coupling between two cut-wire structures. Moreover, the strength and frequency of the EIT peak, the associated group delay and delay bandwidth product can be actively controlled. Therefore, the work presents a novel modulation strategy for controlling EIT behavior and exhibits potential applications for switching, modulation, and slow-light devices.

Keywords:

• Graphene
• terahertz
• metamaterials
• tunable
• electromagnetically induced transparency

Additional information

Funding

The work is supported by the National Natural Science Foundation of China (51672062, 51575149, 61501275 and 51402075), Natural Science Foundation of Heilongjiang Province (LH2019F022), and Project of Innovative and Entrepreneurship Training Program for College students in Heilongjiang Province (201810214105).