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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 2 — Jan. 17, 2011
  • pp: 467–475

Gold-nanoparticle-assisted random lasing from powdered GaN

Toshihiro Nakamura, Tomohiro Hosaka, and Sadao Adachi  »View Author Affiliations

Optics Express, Vol. 19, Issue 2, pp. 467-475 (2011)

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We demonstrate Au-nanoparticle-assisted random lasing from a powdered GaN sample. In the presence of Au nanoparticles on GaN powder surfaces, several lasing lines are observed in photoexcited luminescence spectra near the center of the GaN band-edge emission peak. The random lasing is considered to arise from a decrease in the lasing threshold due to the suppression of crystal defect loss by surface plasmon excitation on Au. From spatially resolved lasing emission spectra and their FT analysis results, the formation of random lasing cavities at different spatial positions is confirmed. The size of the random lasing spot is determined to be larger than that of the scattered light speckle of the pumping source on a thin powdered GaN sample.

© 2011 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(160.6000) Materials : Semiconductor materials
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Lasers and Laser Optics

Original Manuscript: November 30, 2010
Revised Manuscript: December 18, 2010
Manuscript Accepted: December 21, 2010
Published: January 3, 2011

Toshihiro Nakamura, Tomohiro Hosaka, and Sadao Adachi, "Gold-nanoparticle-assisted random lasing from powdered GaN," Opt. Express 19, 467-475 (2011)

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