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(a) Far-field (red open circles) and (b) near-field PL spectra of ZnO QDs. The respective separation, d, between the fiber and the ZnO QD was (a) 1 μm and (b) 5 nm. (c) Energy states in 4-nm-diameter, spherical ZnO QDs. A: The quantized energies for (a). B: The quantized energies for (b).
(a) Excitation-power dependence of the near-field PL spectra. (b) Excitation power dependence of the integrated PL intensity.
Near-field intensity mappings at (a) 3.423 eV (I 1), (b) 3.4780 eV (I 2), and (c) 3.551 eV (I 3). Cross-sectional profiles of normalized PL intensity of (d) i 1 and (e) i 2 and i 3 at y = 0.8 μm in (a) and (b). (f) Cross-sectional profile of and .
(a)-(c) PL spectra at x = 0.120 μm (a), 0.160 μm (b), and 0.20 μm (c) in Fig. 3(d).
Schematic representation of the fiber probe scanning over the dispersed ZnO QDs.
The ratio between near-field and far-field intensity in each energy state.
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