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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Dual-function terahertz metamaterial absorber based on microfluidic structures.

Hongyi Ge, Keke Jia, Yuying Jiang

    Optics Express
    |August 13, 2025
    PubMed
    Summary
    This summary is machine-generated.

    A novel terahertz metamaterial sensor using vanadium dioxide (VO2) offers dual functionality for broadband absorption and high-sensitivity liquid biosensing, overcoming previous detection challenges.

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    Area of Science:

    • Terahertz metamaterials
    • Biosensing technologies
    • Advanced material science

    Background:

    • Terahertz metamaterial sensors show promise for label-free biosensing.
    • Detecting high-absorption liquid samples with terahertz waves remains challenging.

    Purpose of the Study:

    • To propose a dual-function absorber for broadband absorption and high-sensitivity sensing.
    • To overcome limitations in detecting liquid samples using terahertz waves.

    Main Methods:

    • Utilizing microfluidic technology and the phase change properties of vanadium dioxide (VO2).
    • Incorporating a VO2 film as a separation layer and a VO2 square resonator.
    • Dynamically switching between broadband absorption and sensing modes.

    Main Results:

    • The structure acts as a broadband absorber (>90% absorption from 1.09-3.02 THz) when VO2 is in its metallic state.
    • As a sensor, it achieves >99.9% absorption at specific frequencies with high refractive index sensitivities (532 and 785 GHz/RIU).
    • The device demonstrates polarization insensitivity and stability at large incident angles.

    Conclusions:

    • This dual-function structure enhances traditional absorbers and sensors.
    • It holds potential for electromagnetic cloaking, energy harvesting, and biomedical detection.