Europhys. Lett.
Volume 68, Number 5, December 2004
Page(s) 740 - 745
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 05 November 2004
Europhys. Lett., 68 (5), pp. 740-745 (2004)
DOI: 10.1209/epl/i2004-10264-8

Laser emission of low-threshold excitation from $\chem{ZnO}$ nanowires

Li Cao, Bingsuo Zou, Chaorong Li, Zebo Zhang, Sishen Xie and Guozhen Yang

Beijing National Lab for Condensed Matter Physics Institute of Physics, CAS - Beijing 100080, PRC

received 8 June 2004; accepted in final form 12 October 2004
published online 5 November 2004

We prepared $\chem{ZnO}$ nanowires with a controlled reaction in an asymmetrical tube, the nanowire is composed with aligned $\chem{ZnO}$ QDs packing in the same crystal axis. An anomalous giant oscillator strength was observed in the absorption spectra of the nanowire sol at room temperature. This sol shows stimulated emission at the excitation of a CW $\chem{He}$- $\chem{Cd}$ laser up to an excitation power of more than one hundred.

78.67.Lt - Quantum wires.
71.36.+c - Polaritons (including photon-phonon and photon-magnon interactions).
78.45.+h - Stimulated emission.

© EDP Sciences 2004