Random lasing in closely packed resonant scatterers

Xiaohua H. Wu, Alexey Yamilov, Heeso Noh, Hui Cao, Eric W. Seelig, Robert P. H. Chang

Research output: Contribution to journalArticle

107 Citations (Scopus)

Abstract

We report experimental and theoretical studies of the random lasing threshold and its fluctuation in an ensemble of highly packed spherical dielectric scatterers. The ratio of the sphere diameter to the lasing wavelength was varied in a wide range, which covered the transition from the weak Rayleigh scattering regime to the strong Mie scattering regime. Experimentally, when the diameters of monodispersed ZnO spherical particles changed from less than 100 to more than 600 nm we observed a drastic decrease of the lasing threshold at small-particle size followed by a plateau at large particle size. We attribute this effect to the particle-size dependence of transport mean free path lt, which was deduced from coherent backscattering measurements. Theoretical calculation of lt reproduced experimental behavior. Using the finite-difference time domain method, we obtained the lasing threshold and its standard deviation as functions of particle size in two-dimensional systems. The results of our numerical simulations are in qualitative agreement with the experimental data.

Original languageEnglish
Pages (from-to)159-167
Number of pages9
JournalJournal of the Optical Society of America B: Optical Physics
Volume21
Issue number1
DOIs
Publication statusPublished - 2004

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lasing
scattering
thresholds
Mie scattering
Rayleigh scattering
finite difference time domain method
mean free path
standard deviation
plateaus
backscattering
wavelengths
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Random lasing in closely packed resonant scatterers. / Wu, Xiaohua H.; Yamilov, Alexey; Noh, Heeso; Cao, Hui; Seelig, Eric W.; Chang, Robert P. H.

In: Journal of the Optical Society of America B: Optical Physics, Vol. 21, No. 1, 2004, p. 159-167.

Research output: Contribution to journalArticle

Wu, Xiaohua H. ; Yamilov, Alexey ; Noh, Heeso ; Cao, Hui ; Seelig, Eric W. ; Chang, Robert P. H. / Random lasing in closely packed resonant scatterers. In: Journal of the Optical Society of America B: Optical Physics. 2004 ; Vol. 21, No. 1. pp. 159-167.
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