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Stimulated emission from ZnO nanorods
Author(s) -
Hauschild R.,
Lange H.,
Priller H.,
Klingshirn C.,
Kling R.,
Waag A.,
Fan H. J.,
Zacharias M.,
Kalt H.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200564718
Subject(s) - nanorod , materials science , exciton , substrate (aquarium) , spectroscopy , laser , rod , nanoparticle , optoelectronics , nanotechnology , electric field , optics , condensed matter physics , physics , medicine , oceanography , alternative medicine , pathology , quantum mechanics , geology
By means of time resolved spectroscopy we compare two samples of ZnO nanorods with respect to their suitability as stimulated emitters. In the case of narrow nanorods their wave guiding quality causes a suppression of exciton–exciton scattering whereas no laser emission is detectable. Unlike their narrow counterparts, wide nanorods not only benefit from a larger overlap of the guided mode with the gain medium but a variation in VLS growth results in gold nanoparticles being present at the bottom of nanorods. Consequently, laser emission from single wide rods is evidenced up to 150 K. In addition to experimental studies we carry out 3D numerical simulations of the electric field distribution to evaluate the influence of gold nanoparticles at the nanorod/substrate interface. This finite element analysis confirms that gold leads to an enhancement of confinement within the resonator. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)