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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 4 — Apr. 1, 2012
  • pp: 490–495

Observation of white-light amplified spontaneous emission from carbon nanodots under laser excitation

Wen Fei Zhang, Li Bin Tang, Siu Fung Yu, and Shu Ping Lau  »View Author Affiliations

Optical Materials Express, Vol. 2, Issue 4, pp. 490-495 (2012)

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A conventional laser irradiation method is applied to fabricate carbon nanodots (C-dots). By uniformly dispersing the C-dots into N-Methylpyrrolidone (NMP) solution, white-light amplified spontaneous emission can be observed from the mixture under laser excitation at 266 nm. Peak wavelength and linewidth of the emission spectra are found to be around 450 and 120 nm respectively. It is verified that the presence of NMP enhances the emission efficiency of C-dots over the broad emission spectrum. This is because the excitation energy, which is not absorbed by the C-dots, is captured by the NMP and is subsequently transferred to the C-dots. Optical gain per peak power of the mixture at ~450 nm is found to be ~64 cm–1MW–1, which is about 39% higher than that without the use of NMP.

© 2012 OSA

OCIS Codes
(140.3380) Lasers and laser optics : Laser materials
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:

Original Manuscript: February 2, 2012
Revised Manuscript: February 18, 2012
Manuscript Accepted: February 22, 2012
Published: March 28, 2012

Virtual Issues
Nanocarbon for Photonics and Optoelectronics (2012) Optical Materials Express
May 10, 2012 Spotlight on Optics

Wen Fei Zhang, Li Bin Tang, Siu Fung Yu, and Shu Ping Lau, "Observation of white-light amplified spontaneous emission from carbon nanodots under laser excitation," Opt. Mater. Express 2, 490-495 (2012)

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