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Related Experiment Video

Updated: Apr 6, 2026

Gold Nanostar Synthesis with a Silver Seed Mediated Growth Method
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Gold nanostars for random lasing enhancement.

Johannes Ziegler, Martin Djiango, Cynthia Vidal

    Optics Express
    |July 21, 2015
    PubMed
    Summary
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    Star-shaped gold nanoparticles, or nanostars, significantly enhance random laser performance. These nanostars improve lasing thresholds and emission intensity compared to conventional nanoparticle shapes.

    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Laser Physics

    Background:

    • Random lasers offer a unique approach to coherent light generation.
    • Nanoparticle scattering is crucial for forming resonant cavities in random lasers.
    • The shape of nanoparticles can influence their plasmonic properties and scattering efficiency.

    Purpose of the Study:

    • To investigate the efficacy of star-shaped gold nanoparticles (nanostars) as scattering centers in dye-doped random lasers.
    • To compare the performance of nanostar-based random lasers with those using conventional nanoparticle shapes.
    • To elucidate the role of plasmonic field enhancements from nanostars in improving random laser characteristics.

    Main Methods:

    • Fabrication of thin films containing dye-doped gain medium with randomly distributed gold nanoparticles (nanostars, spheres, or prolates).

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  • Characterization of random lasing properties under single-pulsed laser excitation.
  • Analysis of lasing thresholds, emission spectra, and linewidths.

    • Main Results:

    • Star-shaped gold nanoparticles demonstrated superior performance as scattering centers in random lasers compared to spherical or prolate nanoparticles.
    • Random lasers incorporating nanostars exhibited low coherent lasing thresholds around 0.9 mJ/cm(2).
    • Spectrally narrow emission peaks with linewidths below 0.2 nm were observed, indicating efficient mode confinement.

    Conclusions:

    • Nanostars serve as highly effective scattering elements for random lasers, outperforming conventional shapes.
    • The enhanced plasmonic field localization at the tips of nanostars improves the feedback mechanism, leading to higher emission intensity and lower lasing thresholds.
    • This study highlights the potential of nanostars for developing advanced random laser devices.