Graphene Reflectarray Metasurface for Terahertz Beam Steering and Phase Modulation

TL;DR

This paper presents a graphene-based reconfigurable reflectarray metasurface capable of beam steering and phase modulation at terahertz frequencies, enabling compact and versatile optical devices.

Contribution

It introduces a voltage-controlled graphene metasurface for broadband phase control and beam steering, replacing traditional bulky optical components.

Findings

Achieved dynamic beam steering and phase modulation in the terahertz range.

Demonstrated broadband reconfigurability of the graphene metasurface.

Potential applications in optical devices like light radars and adaptive optics.

Abstract

We report a THz reflectarray metasurface which uses graphene as active element to achieve beam steering, shaping and broadband phase modulation. This is based on the creation of a voltage controlled reconfigurable phase hologram, which can impart different reflection angles and phases to an incident beam, replacing bulky and fragile rotating mirrors used for terahertz imaging. This can also find applications in other regions of the electromagnetic spectrum, paving the way to versatile optical devices including light radars, adaptive optics, electro-optical modulators and screens.