Whispering gallery modes in zinc oxide micro- and nanowires
Article first published online: 18 MAY 2010
Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
physica status solidi (b)
Volume 247, Issue 6, pages 1282–1293, June 2010
How to Cite
Czekalla, C., Nobis, T., Rahm, A., Cao, B., Zúñiga-Pérez, J., Sturm, C., Schmidt-Grund, R., Lorenz, M. and Grundmann, M. (2010), Whispering gallery modes in zinc oxide micro- and nanowires. Phys. Status Solidi B, 247: 1282–1293. doi: 10.1002/pssb.200945527
- Issue published online: 26 MAY 2010
- Article first published online: 18 MAY 2010
- Manuscript Accepted: 16 APR 2010
- Manuscript Revised: 3 MAR 2010
- Manuscript Received: 11 NOV 2009
- Deutsche Forschungsgemeinschaft within FOR522. Grant Numbers: Gr1011/12-1, 12-2
Optical whispering gallery mode (WGM) resonances have been observed in zinc oxide micro- and nanowire cavities. Using model calculations, the experimentally observed mode spectrum was reproduced. The effect has been observed for wire radii between 100 nm and 10 µm corresponding to angular mode numbers from 1 to about 250. The whispering gallery effect was used to determine the refractive index of the wires as a function of the photon energy and temperature. Under high excitation conditions, WGM lasing was observed. Two methods for calculating the complex resonant modes are presented: a simple plane wave model and the numerical solution of the Helmholtz equation for the given resonator geometry.
A typical photoluminescence (PL) spectrum showing WGM resonances and (inset) a scanning electron microscopy (SEM) image of a zinc oxide (ZnO) microwire.