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Enhanced-performance and wavelength-tunable magnetically controlled random lasing based on magnetic-plasmonic

Shuya Ning, Dingming Zhao, Naming Zhang

    Optics Letters
    |October 15, 2024
    PubMed
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    Researchers developed a magnetically controlled random lasing system using R6G solution with Fe3O4/Au nanoparticles. This system enhances lasing performance and allows real-time wavelength tuning via an external magnetic field.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Random lasing offers broad applications but requires enhanced performance and tunability.
    • Magnetic and plasmonic nanoparticles can modify optical properties of gain media.
    • Controlling nanoparticle distribution is key to tuning lasing characteristics.

    Purpose of the Study:

    • To develop a magnetically controlled random lasing system with enhanced performance and wavelength tunability.
    • To investigate the effect of Fe3O4/Au nanoparticles on random lasing properties.
    • To achieve real-time tuning of random lasing emission modes using an external magnetic field.

    Main Methods:

    • Fabrication of R6G solution doped with Fe3O4/Au nanoparticles.
    • Characterization of nanoparticle magnetic and plasmonic properties.

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  • Measurement of random lasing threshold and emission spectra under external magnetic field control.

    • Main Results:

    • Fe3O4/Au nanoparticles significantly lowered the random lasing threshold (37.6% of net gain medium).
    • Plasmonic effects and larger scattering cross-section of Fe3O4/Au NPs enhance lasing.
    • External magnetic field enabled real-time tuning of random lasing emission modes.
    • Switching between random lasing and amplified spontaneous emission was achieved.

    Conclusions:

    • The developed system demonstrates enhanced random lasing performance and wavelength tunability.
    • Fe3O4/Au nanoparticles are effective in improving random lasing properties.
    • Magnetic field control offers a simple and effective method for tuning lasing emission and achieving switching functionalities.