Ultraviolet whispering-gallery-mode lasing in ZnO micro/nano sphere crystal

Kota Okazaki, Tetsuya Shimogaki, Koshi Fusazaki, Mitsuhiro Higashihata, Daisuke Nakamura, Naoto Koshizaki, Tatsuo Okada

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


We report ultraviolet (UV) whispering-gallery-mode (WGM) lasing in a zinc oxide (ZnO) micro/nanosphere crystal fabricated by simply ablating a ZnO sintered target, which was much more productive method without any time-consuming crystal-growth process. The lasing spectral mode spacing was controlled by changing the diameters, and single-mode lasing was realized from a ZnO nanosphere. Experimental results were in good agreement with predictions from WGM theories. Since the ZnO sphere can operate as an active WGM refractometric sensor for small molecules in UV region, high sensitivity enhanced by high quality factor, refractive index, and wavelength dispersion can be expected.

Original languageEnglish
Article number211105
JournalApplied Physics Letters
Issue number21
Publication statusPublished - Nov 19 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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