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Related Experiment Video

Updated: Jun 5, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Gate-tuned graphene meta-devices for dynamically controlling terahertz wavefronts.

Qiushi Li¹, Xiaodong Cai¹, Tong Liu²

¹Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

Researchers developed a novel method for terahertz (THz) wavefront control using graphene. This approach enables dynamic THz beam steering and polarization manipulation for advanced applications.

Keywords:

coupled mode theory graphene metasurfaces terahertz wavefront manipulations

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Last Updated: Jun 5, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

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Published on: February 4, 2018

Fabricating Metamaterials Using the Fiber Drawing Method

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Published on: October 18, 2012

Area of Science:

Optics and Photonics
Materials Science
Electrical Engineering

Background:

Dynamical control of terahertz (THz) wavefronts is essential for numerous applications.
Existing methods often rely on sub-micrometer tunable elements, which are challenging to implement in the THz spectrum.

Purpose of the Study:

To propose and demonstrate a new approach for THz wavefront control using globally tuned graphene layers combined with metasurfaces.
To overcome limitations of local-tuning mechanisms in THz meta-devices.

Main Methods:

Utilizing coupled-mode-theory (CMT) to analyze the tunable loss mechanism of graphene.
Designing and fabricating a graphene-based meta-device.
Experimentally demonstrating THz wave reflection control with varying polarization.
Numerically simulating the generation of vectorial THz beams with tunable polarization.

Main Results:

Graphene acts as a tunable loss element, enabling phase transitions in the meta-device.
Experimental validation of directional THz wave reflection control via gating voltages.
Numerical demonstration of continuously tunable vectorial THz beam generation.

Conclusions:

The proposed global tuning approach offers a viable alternative for THz wavefront control.
This technology has significant potential for applications in THz sensing, imaging, and wireless communications.