Abstract
Nonpolar (Zn,Cd)O/(Mg,Zn)O multiple quantum wells (MQWs) were deposited in radial direction on ZnO nanowires using pulsed-laser deposition. The heterostructures with diameters in the micro regime exhibit both excitonic and optical confinement. Making use of the quantum confinement effect, the QW-related emission was tuned between 2.46 and 3.35 eV. Because of the cavity properties of the resonator with hexagonal cross section, hexagonal whispering gallery modes (WGMs) are observed up to energies close to the (Mg,Zn)O bandgap, enabling a spatial and spectral overlap of the MQW luminescence and the WGM. The resonant WGM energies were reproduced by using resonant wave numbers from numerical calculations.
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