Optimizing Broadband Terahertz Modulation with Hybrid Graphene/Metasurface Structures

TL;DR

This paper presents a hybrid graphene/metasurface device that achieves efficient broadband terahertz modulation by leveraging strong coupling and tunable graphene conductivity, enabling advanced THz applications.

Contribution

It introduces a novel hybrid structure combining graphene with a broadband gold slit metasurface for enhanced THz modulation capabilities.

Findings

Achieved near-unity broadband transmission in the metasurface.

Demonstrated significant modulation of THz transmission using tunable graphene.

Provided a platform for future nonlinear THz spectroscopy studies.

Abstract

We demonstrate efficient terahertz (THz) modulation by coupling graphene strongly with a broadband THz metasurface device. This THz metasurface, made of periodic gold slit arrays, shows near unity broadband transmission, which arises from coherent radiation of the enhanced local-field in the slits. Utilizing graphene as an active load with tunable conductivity, we can significantly modify the local-field enhancement and strongly modulate the THz wave transmission. This hybrid device also provides a new platform for future nonlinear THz spectroscopy study of graphene.