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PL spectrum (black line) of InAs quantum dots embedded in a PhC waveguide measured at 10 K with a pump power of . The dashed red line shows a multi-Lorentzian fit of the sharp quantum dot lines and a Gaussian function to fit the broad peak (blue line), which is a signature of the PhC crystal waveguide band edge. Top left inset: SEM image of the PhC waveguide. Top right inset: temperature dependence of the quantum dot emission wavelength of five selected quantum dots (denoted QD1..5), marked with arrows in the main panel (filled circles), and of the PhC waveguide band edge (open circles). The lines are second order polynomial fits to the data.
(a) Decay curves of a single quantum dot (QD3) measured with 5 K steps in a temperature range between 10 and 60 K and plotted as a function of the emission wavelength. (b) Decay rates of QD3 extracted from the data shown in panel (a) as a function of detuning relative to the waveguide band edge [filled circles, whose color relates to the temperature color bar in panel (a)]. The error bar shows the spectral resolution and is representative for all the data points. The two dashed lines labeled with and mark the fastest decay rate on resonance with the PhC waveguide band edge and the slowest decay rate when the quantum dot emission lies in the PhC band gap, respectively. The solid line represents the decay rate calculated for a lossless PhC waveguide where the out-of-plane radiation contribution is set to . The curve has been scaled by a factor 0.04 to match the experimental data points accounting for spatial mismatch between the quantum dot position and polarization relative to the waveguide electric field.
Decay rates of the five quantum dots marked with arrows in the spectrum in Fig. 1 plotted as a function of the emission wavelength. The extracted -factors for four quantum dots are shown in the legend.
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