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Related Experiment Video

Updated: Aug 2, 2025

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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Tuning Smith-Purcell radiation by rotating a metallic nanodisk array.

Fei Chen, Ren-Hao Fan, Jun-Xuan Chen

    Optics Letters
    |April 14, 2023
    PubMed
    Summary

    Tunable Smith-Purcell radiation (SPR) was achieved by rotating a 2D nanodisk array with an electron beam. This method enables wavelength modulation for nanoscale light sources.

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    Area of Science:

    • Physics
    • Materials Science
    • Nanotechnology

    Background:

    • Smith-Purcell radiation (SPR) is strong, far-field radiation from charged particles interacting with a medium.
    • Wavelength tunability of SPR is crucial for applications like particle detection and nanoscale light sources.

    Purpose of the Study:

    • To demonstrate tunable SPR using a 2D metallic nanodisk array.
    • To explore the mechanism behind wavelength modulation in SPR.

    Main Methods:

    • An electron beam was moved parallel to a 2D metallic nanodisk array.
    • The nanodisk array was rotated in-plane to tune the SPR emission spectrum.

    Main Results:

    • Rotating the nanodisk array caused the SPR spectrum to split into two peaks.

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  • The shorter-wavelength peak blueshifted, and the longer-wavelength peak redshifted with increasing rotation angle.
  • Experimental results matched simulation data, confirming the effect.

    • Conclusions:

    • Tunable SPR was successfully achieved by manipulating a 2D nanodisk array with an electron beam.
    • The observed wavelength modulation is linked to quasiperiodic characteristics projected from the 2D lattice.
    • This technique offers potential for developing free-electron-driven, tunable nanoscale photon sources.