Lasing characteristics of an optically pumped single ZnO nanosheet

Kota Okazaki, Daisuke Nakamura, Mitsuhiro Higashihata, Palani Iyamperumal, Tatsuo Okada

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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 thirdharmonic 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.

Original languageEnglish
Pages (from-to)20389-20394
Number of pages6
JournalOptics Express
Volume19
Issue number21
DOIs
Publication statusPublished - Oct 10 2011

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Okazaki, K., Nakamura, D., Higashihata, M., Iyamperumal, P., & Okada, T. (2011). Lasing characteristics of an optically pumped single ZnO nanosheet. Optics Express, 19(21), 20389-20394. https://doi.org/10.1364/OE.19.020389