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Gold-nanoparticle-assisted random lasing from powdered GaN.

Toshihiro Nakamura1, Tomohiro Hosaka, Sadao Adachi

  • 1Graduate School of Engineering, Gunma University, Gunma, Japan. nakamura@el.gunma-u.ac.jp

Optics Express
|January 26, 2011
PubMed
Summary

Gold nanoparticles assist random lasing in gallium nitride (GaN) powder. This technique lowers the lasing threshold by reducing crystal defects, enabling new possibilities for GaN-based photonic devices.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Gallium nitride (GaN) is a crucial semiconductor for optoelectronic applications.
  • Random lasing offers a unique approach to light emission but often requires high thresholds.
  • Gold nanoparticles can modify optical properties through surface plasmon resonance.

Purpose of the Study:

  • To investigate the effect of gold nanoparticles on random lasing in GaN powder.
  • To understand the mechanism behind nanoparticle-assisted random lasing.
  • To characterize the spatial properties of the random lasing emission.

Main Methods:

  • Fabrication of GaN powder samples with surface-deposited gold nanoparticles.
  • Photoexcitation spectroscopy to observe luminescence and lasing lines.

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  • Spatially resolved emission spectra and Fast Fourier Transform (FFT) analysis.

    • Main Results:

    • Observation of multiple random lasing lines in GaN powder with gold nanoparticles.
    • Attribution of reduced lasing threshold to surface plasmon excitation suppressing crystal defect loss.
    • Confirmation of random lasing cavity formation at various spatial locations.
    • Determination of random lasing spot size exceeding pump light speckle size.

    Conclusions:

    • Gold nanoparticles effectively enable and enhance random lasing in GaN powder.
    • Surface plasmon effects are key to lowering the lasing threshold and improving efficiency.
    • This method provides a pathway for developing novel GaN-based random laser devices.