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Related Experiment Video

Updated: Aug 25, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Terahertz device utilizing a transmissive geometric metasurface.

Jiu-Sheng Li, Yi Chen

    Applied Optics
    |October 18, 2022
    PubMed
    Summary

    Researchers developed a novel metasurface device capable of generating and controlling terahertz vortex beams with orbital angular momentum (OAM). This breakthrough offers potential for advanced wireless communication systems.

    Area of Science:

    • Physics
    • Electrical Engineering
    • Materials Science

    Background:

    • Orbital angular momentum (OAM) vortex beams are crucial for high-capacity wireless communication.
    • Generating and controlling OAM vortex beams, especially in the terahertz (THz) spectrum, presents significant challenges.

    Purpose of the Study:

    • To propose a novel metasurface-based scheme for generating and controlling terahertz vortex beams with tailored orbital angular momentum (OAM).
    • To investigate the manipulation of OAM modes under different polarizations of incident terahertz waves.

    Main Methods:

    • Design of a meta-unit cell comprising patterned metallic layers and a silica dielectric spacer.
    • Utilizing full-wave simulations to analyze the performance of the proposed metasurface device.
    • Investigating the generation of two/four splitting vortex beams and focusing vortex beams with varying topological charges.

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    Main Results:

    • The metasurface successfully generates vortex beams with distinct topological charges under both left and right circularly polarized terahertz waves.
    • Simulation results demonstrate excellent agreement with theoretical predictions.
    • The device exhibits the capability to carry and abruptly manipulate different OAM modes during propagation.

    Conclusions:

    • The proposed terahertz metasurface-based devices offer a promising approach for generating and controlling OAM vortex beams.
    • These devices hold significant potential for future applications in high-capacity terahertz wireless communication links.