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Related Experiment Video

Updated: Jul 9, 2025

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Reconfigurable three multi-mode terahertz metasurface.

Jiu-Sheng Li, Jia-Hui Ren, Ri-Hui Xiong

    Optics Express
    |November 29, 2023
    PubMed
    Summary

    This study introduces a reconfigurable terahertz metasurface capable of multiple functions. The device utilizes adjustable conductivity for tunable terahertz focusing, vortex beams, and imaging, advancing information security and device design.

    Area of Science:

    • Metamaterials and Nanophotonics
    • Terahertz (THz) Technology
    • Optoelectronics

    Background:

    • Metasurfaces offer novel ways to manipulate electromagnetic waves.
    • Achieving multi-functionality and reconfigurability in metasurfaces is crucial for advanced applications.
    • Terahertz technology demands efficient and versatile wave manipulation devices.

    Purpose of the Study:

    • To design and demonstrate a reconfigurable multi-mode terahertz metasurface.
    • To achieve multiple functionalities including focusing, vortex beam generation, and imaging using a single unit cell.
    • To explore the potential of such devices in terahertz information security and multifunctional device design.

    Main Methods:

    • A unit cell comprising concentric elliptical rings of copper, vanadium oxide, and photosensitive silicon was designed.

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  • The conductivity of vanadium oxide and photosensitive silicon was controlled by external temperature and pump light intensity.
  • The metasurface's arrangement and stimulus were encoded to achieve different transmission characteristics and functions across terahertz bands.

    • Main Results:

    • The designed unit cell demonstrated three distinct states with unique transmission properties in various terahertz bands.
    • Reconfigurable terahertz focusing with adjustable focal length was achieved.
    • Vortex beams with varying topological charges and near-field imaging with different patterns were successfully demonstrated.

    Conclusions:

    • The proposed concentric elliptical ring metasurface offers a novel approach for reconfigurable terahertz wave manipulation.
    • The ability to switch between multiple functions (focusing, vortex beams, imaging) enhances device versatility.
    • This work presents a new paradigm for designing multifunctional and multifrequency terahertz devices for applications in information security and beyond.