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(Color online) (a) Schematic of the experimental apparatus, showing the pump and collection configurations studied here. (b) Emission from a single QD using free-space collection (top) and fiber taper collection (bottom), under identical free-space pumping conditions (, incident power). The inset shows emission over a broad wavelength range from the ensemble of QDs within the microdisk. The shaded region from is the spectral region where single QD emission has been observed.
(Color online) (a) Normalized emission spectra from a single QD for different free-space incident pump powers and using fiber taper collection. (b) log-log plot of the collected emission for the (●), (엯), (×), (◻), (◇), and (▵) QD states of part (a). The dashed lines are least squares fits to the emission data below saturation, assuming , where is the collected photon count rate emitted into a given line and is the pump power. (c) Linewidth of the QD exciton states and as a function of temperature.
(Color online) Spatially resolved measurements using fiber taper pumping and collection. (a) Collected emission spectrum as a function of taper position along the axis of the sample for nonresonant pumping through the fiber taper. (b) Spatial dependence of the integrated emission into each QD line. (c) Emission spectrum for nonresonant pumping with the taper at and an input power of (top), and for resonant pumping of a microdisk WGM in the pump band at a power of (bottom). The triangles (▿) indicate the position of WGM resonances. (d) Wavelength scan of the WGM used to pump the sample in (c).
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