Active control of broadband plasmon-induced transparency in terahertz hybrid metal-graphene metamaterial

TL;DR

This paper demonstrates active, electrically tunable control of broadband plasmon-induced transparency in a terahertz hybrid metal-graphene metamaterial, enabling dynamic modulation of transparency and slow light for advanced THz applications.

Contribution

It introduces a novel hybrid metamaterial design that allows active control over broadband PIT and slow light regions via graphene positioning, offering enhanced tunability.

Findings

Achieved electrically switchable broadband PIT in THz regime.

Demonstrated dynamic modulation of transparency bandwidth.

Enabled tunable slow light regions in the metamaterial.

Abstract

A hybrid metal-graphene metamaterial (MM) is reported to achieve the active control of the broadband plasmon-induced transparency (PIT) in THz region. The unit cell consists of one cut wire (CW), four U-shape resonators (USRs) and monolayer graphene sheets under the USRs. Via near-field coupling, broadband PIT can be produced through the interference between different modes. Based on different arrangements of graphene positions, not only can we achieve electrically switching the amplitude of broadband PIT, but also can realize modulating the bandwidth of the transparent window. Simultaneously, both the capability and region of slow light can be dynamically tunable. This work provides schemes to manipulate PIT with more degrees of freedom, which will find significant applications in multifunctional THz modulation.