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Related Experiment Video

Updated: Sep 11, 2025

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Two to four THz decoding device with an encoding function based on the PCM and PIT effect.

Aijun Zhu, Wenrui Wei, Weigang Hou

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    This study introduces a novel terahertz metamaterial device. It uniquely combines plasma-induced transparency and phase-change materials for advanced 2-4 decoding and 2-bit encoding functions.

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    Area of Science:

    • Terahertz metamaterials
    • Plasmonics
    • Nanophotonics

    Background:

    • Plasma-induced transparency (PIT) enables novel optical functionalities.
    • Phase-change materials (PCMs) offer dynamic control over material properties.
    • Terahertz (THz) technology requires advanced devices for applications like sensing and communication.

    Purpose of the Study:

    • To propose and demonstrate a novel terahertz metamaterial device.
    • To achieve 2-4 decoding and 2-bit encoding functions.
    • To enable active switching of terahertz devices using temperature and Fermi level control.

    Main Methods:

    • Utilizing a terahertz metamaterial structure incorporating vanadium dioxide (VO2) and graphene.
    • Actively switching the device's polarization characteristics and PIT effect via temperature and Fermi level modulation.
    • Implementing 2-bit encoding by controlling the intermediate graphene layer's Fermi level.
    • Achieving 2-4 decoding by adjusting incidence polarization and the top graphene layer's Fermi level.

    Main Results:

    • Demonstrated a 2-bit encoding function with a maximum modulation depth (MD) of 95%, minimum extinction ratio (ER) of 10.42 dB, and insertion loss (IL) of 2.21 dB.
    • Achieved a 2-4 decoding function with a maximum MD of 94.50%.
    • The device exhibits switchable polarization characteristics and PIT effect.

    Conclusions:

    • The proposed device integrates PIT and PCM for multifunctional terahertz applications.
    • It offers a simple structure, high integration, and ease of tuning.
    • This design significantly advances the development of switchable terahertz metamaterial devices.