Active Manipulation of Electromagnetically Induced Transparency in a Terahertz Hybrid Metamaterial

TL;DR

This paper introduces a hybrid metamaterial with graphene to actively control electromagnetically induced transparency in the terahertz range, enabling on-off modulation of the transparency window for potential THz device applications.

Contribution

A novel hybrid metamaterial integrating graphene is proposed to actively manipulate EIT resonance in the terahertz regime, revealing a new physical mechanism based on graphene's recombination effect.

Findings

Achieved on-to-off modulation of EIT transparency window.

Demonstrated control of resonance strength via Fermi level tuning.

Explained the physical mechanism through a classical two-particle model.

Abstract

The metamaterial analogue of electromagnetically induced transparency (EIT) in terahertz (THz) regime holds fascinating prospects for filling the THz gap in various functional devices. In this paper, we propose a novel hybrid metamaterial to actively manipulate the resonance strength of EIT effect. By integrating a monolayer graphene into a THz metal metamaterial, an on-to-off modulation of the EIT transparency window is achieved under different Fermi levels of graphene. According to the classical two-particle model and the distributions of the electric field and surface charge density, the physical mechanism is attributable to the recombination effect of conductive graphene. This work reveals a novel manipulation mechanism of EIT resonance in the hybrid metamaterial and offers a new perspective towards designing THz functional devices.