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Time-integrated PL spectra collected for 10 s at 10 K temperature, obtained by using an 100-nm-apertured optical fiber tip. The excitation power density is increased from 0.3 to .
Time-integrated PL spectra on different positions on the same sample collected for 10 s at 10 K by using a 100 nm apertured optical fiber tip at the excitation power density of . Here , and represent the energies of the ground and excited states of the large-size and small-size single QDs, respectively.
(Color online) (a) Detailed plot of the PL spectrum in Fig. 2(c). The inset shows the schematic view of the PL images obtained at the selective PL energies of single QDs at (b) 1.3884 eV, (c) 1.3762 eV, and (d) 1.3854 eV. The scanning area is .
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