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Switchable broadband terahertz spatial modulators based on patterned graphene and vanadium dioxide.

Longfang Ye, Xueer Chen, Chunhui Zhu

    Optics Express
    |November 13, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We developed a switchable terahertz spatial modulator using patterned graphene and vanadium dioxide (VO2). This device offers tunable absorption and transmission modes for advanced terahertz applications.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nanotechnology

    Background:

    • Terahertz (THz) spatial modulators are crucial for THz imaging and communication.
    • Developing devices with switchable absorption and transmission modes is challenging.

    Purpose of the Study:

    • To numerically demonstrate a switchable broadband THz spatial modulator.
    • To utilize the phase transition of vanadium dioxide (VO2) and tunable properties of graphene for dual-mode modulation.

    Main Methods:

    • Numerical simulation of a novel modulator design.
    • Incorporation of ginkgo-leaf-patterned graphene and VO2.
    • Exploiting VO2 phase transition and graphene's tunable Fermi energy.

    Main Results:

    • Achieved broadband absorption (>85% from 1.33 to 2.83 THz) with VO2 in metallic state and graphene Fermi energy at 0.8 eV.
    • Demonstrated continuous tuning of absorbance (24.3% to ~100%) and transmittance (87% to 35.5%) by adjusting graphene Fermi level.
    • A three-layer graphene design extended the high-absorbance bandwidth to 3.13 THz.

    Conclusions:

    • The proposed modulator offers flexible switching between absorption and transmission modes with deep modulation depth.
    • The device shows significant potential for various THz smart optoelectronic devices.
    • The combination of graphene and VO2 provides a powerful platform for THz modulation.