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Schematic of experimental setup for near-field PL spectroscopy. (a) Scanning electron micrographic image of the dispersed SQWs. (b) Schematic of SQWs on the ends of ZnO nanorods. : axis of the ZnO stem. : angle between the ZnO stem and the direction of incident light polarization.
(Color online) Near-field PL and absorption spectroscopy of isolated ZnO SQWs at . (a) , : near-field PL spectra. : background noise. Abs.: near-field absorption spectrum. FF: far-field PL spectrum of vertically aligned ZnO SQWs . NOM images of isolated ZnO SQWs obtained at (b) 3.375 and (c) . The rectangle shown in dashed white lines indicates the position of the ZnO stem. (d) Near-field PL spectra of isolated ZnO SQWs at excitation densities ranging from . The integrated PL intensity (e) and homogeneous linewidths (f) as a function of the excitation power density.
Polarization dependence of near-field PL spectra of isolated ZnO SQWs obtained at . (a) , FF: near-field and far-field PL spectra of isolated ZnO SQWs for , 30°, 60°, and 90°. (b) Solid triangles and circles are the polarization dependence of the linewidth of and , respectively in (a). Open triangles are the polarization dependence of linewidth of in (d). (c) Solid triangles and circles are the integrated PL intensities of and , respectively, normalized to the total PL intensities . (d) , FF: near-field and far-field PL spectra, respectively, of isolated ZnO SQWs . Abs.: absorption spectrum.
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