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Electrically tunable liquid crystal terahertz device based on double-layer plasmonic metamaterial.

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    Area of Science:

    • Metamaterials research
    • Terahertz (THz) technology
    • Liquid crystal (LC) applications

    Background:

    • Terahertz (THz) frequencies offer unique properties for spectroscopy and imaging.
    • Tunable metamaterials (MMs) are crucial for controlling THz waves.
    • Existing THz devices often face challenges with modulation depth and insertion loss.

    Purpose of the Study:

    • To design and experimentally verify a nematic liquid crystal (NLC)-based tunable THz plasmonic metamaterial.
    • To achieve a large modulation depth (MD) and low insertion loss (IL).
    • To explore the potential for THz modulators, filters, and switches.

    Main Methods:

    • Fabrication of a two-layered metamaterial structure immersed in NLC.
    • Utilizing the metal metamaterial as an electrode.
    • Experimental verification of the device's performance under varying bias voltages.

    Main Results:

    • Achieved an amplitude modulation depth (MD) of approximately 96% and insertion loss (IL) of 1.19 dB at 421.2 GHz.
    • Demonstrated a frequency tunability (FT) greater than 9.35%, with the transmission peak shifting from 421.2 GHz to 381.8 GHz.
    • The device operates with bias voltage variation from 0 to 16 V.

    Conclusions:

    • The proposed NLC-based tunable THz plasmonic metamaterial demonstrates significant performance metrics.
    • This work offers a viable solution for developing efficient THz modulators, filters, and switches.
    • The integration of NLCs with metamaterials opens new avenues for tunable THz devices.