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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6598–6603

Collective lasing from a linear array of dielectric microspheres with gain

Anjani Kumar Tiwari, Balu Chandra, Ravitej Uppu, and Sushil Mujumdar  »View Author Affiliations

Optics Express, Vol. 20, Issue 6, pp. 6598-6603 (2012)

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We experimentally study the optical emission behavior of a linear array of dielectric microspheres with gain. The microspheres are randomly arranged and well-separated, and can only couple via radiative modes. We observe resolution-limited, ultra-narrowband modes in the longitudinal emission, which constitutes collective lasing from the entire array, inferred from the observation of a lasing threshold. The lasing modes show wavelength selectivity, wherein the lasing probability is large only in specific frequency bands while being inhibited at other wavelengths, a behavior which is independent of the degree of configurational randomness. Analysis of the frequency bands indicates the participation of Fabry-Perot resonances of the individual microspheres in the collective emission.

© 2012 OSA

OCIS Codes
(140.3380) Lasers and laser optics : Laser materials
(230.5750) Optical devices : Resonators
(230.7370) Optical devices : Waveguides
(230.4555) Optical devices : Coupled resonators
(240.3990) Optics at surfaces : Micro-optical devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: January 18, 2012
Revised Manuscript: March 2, 2012
Manuscript Accepted: March 2, 2012
Published: March 6, 2012

Anjani Kumar Tiwari, Balu Chandra, Ravitej Uppu, and Sushil Mujumdar, "Collective lasing from a linear array of dielectric microspheres with gain," Opt. Express 20, 6598-6603 (2012)

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