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Related Experiment Video

Updated: Jan 19, 2026

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Free-electron-driven beam-scanning terahertz radiation.

Juan-Feng Zhu, Chao-Hai Du, Tie-Jun Huang

    Optics Express
    |September 13, 2019
    PubMed
    Summary

    A novel free-electron mechanism enhances terahertz (THz) radiation by using a rod array to control spoof surface plasmon (SSP) properties. This method achieves a 20x intensity increase for THz sources, enabling advanced communication and detection.

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    Area of Science:

    • Physics
    • Electromagnetism
    • Materials Science

    Background:

    • Terahertz (THz) radiation is crucial for advanced applications.
    • Conventional THz sources face limitations in tunability and intensity.
    • Free-electron devices offer potential for novel radiation generation.

    Purpose of the Study:

    • To propose a new beam-scanning THz radiation mechanism.
    • To enhance THz radiation intensity and control its frequency and direction.
    • To develop on-chip THz sources for communication and detection.

    Main Methods:

    • Utilizing a free-electron-driven grating system.
    • Loading a period-asynchronous rod array to modify spoof surface plasmon (SSP) characteristics.
    • Investigating the Brillouin zone folding effect induced by the rod array.

    Main Results:

    • The rod array converts SSP into spatial coherent THz radiation.
    • Radiation frequency and direction are precisely controlled by electron energy.
    • Achieved a ~20x increase in radiation field intensity compared to conventional Smith-Purcell radiation.
    • Validated experimental results with a microwave-band prototype.

    Conclusions:

    • The proposed mechanism offers a viable method for tunable THz radiation.
    • This advancement is significant for on-chip THz source development.
    • Opens pathways for next-generation communication and detection systems.