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Related Experiment Video

Updated: Nov 10, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Active terahertz spin Hall effect in vanadium dioxide metasurfaces.

Lei Kang, Yuhao Wu, Douglas H Werner

    Optics Express
    |April 6, 2021
    PubMed
    Summary

    Vanadium dioxide (VO2) dipole antennas enable geometric phase metasurfaces for THz wave manipulation. This research highlights VO2

    Area of Science:

    • Metamaterials and Nanophotonics
    • Condensed Matter Physics
    • THz Spectroscopy

    Background:

    • Vanadium dioxide (VO2) exhibits a significant insulator-to-metal transition, altering its material properties across a wide frequency range.
    • This transition makes VO2 a promising material for reconfigurable metadevices operating from microwave to optical frequencies.
    • In the THz regime, metallic-phase VO2 microstructures support strong electromagnetic resonances, crucial for active THz radiation manipulation.

    Purpose of the Study:

    • To investigate the use of VO2 dipole antennas for creating geometric phase coded metasurfaces.
    • To demonstrate the application of these metasurfaces for wave-front shaping and polarization rotation of THz waves.
    • To explore the relationship between the THz spin Hall effect efficiency and VO2's THz electrical conductivity.

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    Main Methods:

    • Fabrication of VO2 dipole antennas.
    • Characterization of metasurfaces for THz wave manipulation.
    • Analysis of the THz spin Hall effect and its dependence on VO2 conductivity.

    Main Results:

    • VO2 dipole antennas were successfully employed to realize geometric phase coded metasurfaces.
    • Demonstrated effective wave-front shaping and polarization rotation of THz waves using these metasurfaces.
    • Established a correlation between the efficiency of the THz spin Hall effect and the THz electrical conductivity of VO2.

    Conclusions:

    • Metasurfaces composed of VO2 subwavelength resonators are suitable for active control of broadband THz radiation.
    • The geometric phase, being dispersionless, allows for broadband operation.
    • This work paves the way for advanced active THz devices and applications.