Figure 3
Measured (76 ps bins) and simulated second-order intensity correlation function
of gold electroluminescence driven at 220 MHz. (a) EL intensity autocorrelation from a group of many gold dots (blue) overplotted with an ideal simulation (green dotted line) and after convolution with the finite time response of our detectors (1.1 ns, red line), all showing the 220 MHz ac excitation frequency. Smaller peaks shifted in phase by
radians arise from electron injection through the cathode. (b) Antibunching in single Au nanocluster electroluminescence (blue), overplotted with an ideal simulation (green dotted line), and its convolution with the detector response (red line). The small probability for injection through the cathode is again evidenced by the smaller peaks shifted by
. As described by the simulations, the
peak in (b) is substantially diminished relative to peaks shifted by higher multiples of
. Much faster than the ac excitation period (
), and the time resolution of our two APDs (1.1 ns), the short emission lifetime (
) limits the observable contrast in
measurements but allows for high single-photon data rates. Although readily apparent after only
, the high contrast
at high repetition rates such as that in (b) is obtained in 25 min. Only low frequency intensity changes are statistically significant as the time resolution is much longer than the bin width used.
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