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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 16 — Aug. 12, 2013
  • pp: 19302–19310

Laser cooling of CdS nanobelts: Thickness matters

Dehui Li, Jun Zhang, and Qihua Xiong  »View Author Affiliations

Optics Express, Vol. 21, Issue 16, pp. 19302-19310 (2013)

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We report on the thickness dependent laser cooling in CdS nanobelts pumped by a 532 nm green laser. The lowest achievable cooling temperature is found to strongly depend on thickness. No net cooling can be achieved in nanobelts with a thickness below 65 nm due to nearly zero absorption and larger surface nonradiative recombination. While for nanobelts thicker than ~120 nm, the reabsorption effect leads to the reduction of the cooling temperature. Based on the thickness dependent photoconductivity gain, mean emission energy and external quantum efficiency, the modeling of the normalized temperature change suggests a good agreement with the experimental results.

© 2013 OSA

OCIS Codes
(140.3320) Lasers and laser optics : Laser cooling
(160.6000) Materials : Semiconductor materials

ToC Category:
Lasers and Laser Optics

Original Manuscript: June 6, 2013
Revised Manuscript: July 27, 2013
Manuscript Accepted: July 28, 2013
Published: August 7, 2013

Dehui Li, Jun Zhang, and Qihua Xiong, "Laser cooling of CdS nanobelts: Thickness matters," Opt. Express 21, 19302-19310 (2013)

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