Dresden 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Halbleiterphysik
HL 14: II-VI semiconductors I
HL 14.8: Vortrag
Dienstag, 28. März 2006, 12:45–13:00, POT 151
ZnO nanorods as laser emitters — •Robert Hauschild1, Holger Lange1, Alexander Urban1, Hongjin Fan2, Margit Zacharias2, Claus Klingshirn1, and Heinz Kalt1 — 1Universität Karlsruhe, Karlsruhe, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany
By means of time resolved spectroscopy and numerical calculations we evaluate different ZnO nanorods samples with respect to their suitability as stimulated emitters. The influence of diameter and length on the field enhancement inside the nanorods is studied numerically by solving the scalar Helmholtz equation in 3D. According to our simulations the interface nanorod/substrate is mainly responsible for the low Q value of the nanorod resonators. In one sample a variation in VLS growth results in gold nanoparticles being present at the bottom of nanorods. This layer enhances the resonator properties of the nanorods due to the larger reflectivity. The better mode confinement in these nanorods is also confirmed by the finite element analysis. Consequently, laser emission from single rods of this sample is evidenced up to 150 K.