Lasing in whispering gallery mode in ZnO nanonails.

Authors :: Wang, D.
Seo, H. W.
Tin, C.-C.
Bozack, M. J.
Williams, J. R.
Park, M.
Tzeng, Y.
Source :: Journal of Applied Physics; 5/1/2006, Vol. 99 Issue 9, p093112, 4p, 1 Black and White Photograph, 1 Diagram, 2 Graphs
Publication Year :: 2006
Abstract: We report on the observation of ultraviolet lasing in optically pumped ZnO nanonails synthesized by thermal chemical vapor deposition method. The lasing threshold was found to be 17 MW cm<superscript>-2</superscript>. Very sharp emission peaks (full width at half maximum of 0.08 nm) were observed in the emission spectrum, indicating a high Q factor of the cavity formed by the hexagonally shaped nanonail head. The analysis of the lasing spectra strongly suggests the whispering gallery mode lasing from a hexagonally shaped head of the single ZnO nanonail. [ABSTRACT FROM AUTHOR]