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Advanced Materials

ZnO Nanoribbon Microcavity Lasers


  • This work was supported by the Camille and Henry Dreyfus Foundation, Beckman Foundation, the National Science Foundation and Department of Energy. P. Y. is an Alfred P. Sloan Research Fellow. Work at the Lawrence Berkeley National Laboratory was supported by the Office of Science, Basic Energy Sciences, Division of Materials Science of the U.S. Department of Energy. We thank the National Center for Electron Microscopy for the use of their facilities. H. Yan and J. Johnson contributed equally to this work.


ZnO nanoribbons with pseudo-rectangular cross-sections (see Figure) are demonstarted to be excellent microcavities with a high quality factor (∼ 3000). The lasing threshold is shown to be inversely proportional to the length of the ribbon for pumping intensities lower than the saturation region. Analysis of the emission spectra points to the possibility of the existence of both pure axial modes and “bow-tie” cavity modes.

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