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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 21 — Oct. 10, 2011
  • pp: 20389–20394

Lasing characteristics of an optically pumped single ZnO nanosheet

Kota Okazaki, Daisuke Nakamura, Mitsuhiro Higashihata, Palani Iyamperumal, and Tatsuo Okada  »View Author Affiliations


Optics Express, Vol. 19, Issue 21, pp. 20389-20394 (2011)
http://dx.doi.org/10.1364/OE.19.020389


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Abstract

We report the lasing characteristics of a single ZnO nanosheet optically pumped by ultraviolet laser beam. The ZnO nanosheets were synthesized by a carbothermal chemical vapor deposition method. The ZnO nanosheets dispersed on a silica glass substrate were excited by the third-harmonic of a Q-switched Nd:YAG laser (λ = 355 nm, τ = 5 ns) and photoluminescence from a single ZnO nanosheet was observed. The observed emission spectra showed the obvious lasing characteristics having modal structure and threshold characteristics. The threshold power for lasing was measured to be 50 kW/cm2, which was much lower than 150 kW/cm2, the threshold power of the reference ZnO nanowire. It indicates that the ZnO nanosheet is a superior gain medium for an ultraviolet laser. The oscillation mechanism inside a ZnO nanosheet is attributed to the micro-cavity effect, based on the three-dimensional laser-field simulation.

© 2011 OSA

OCIS Codes
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(140.5960) Lasers and laser optics : Semiconductor lasers
(160.6000) Materials : Semiconductor materials
(300.6540) Spectroscopy : Spectroscopy, ultraviolet
(160.4236) Materials : Nanomaterials

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: July 6, 2011
Revised Manuscript: September 21, 2011
Manuscript Accepted: September 21, 2011
Published: October 3, 2011

Citation
Kota Okazaki, Daisuke Nakamura, Mitsuhiro Higashihata, Palani Iyamperumal, and Tatsuo Okada, "Lasing characteristics of an optically pumped single ZnO nanosheet," Opt. Express 19, 20389-20394 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-21-20389


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