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In our work, we have engineered low capacitance single quantum dotphotodiodes as sensor devices for the optoelectronic sampling of ultrafastelectric signals. By the Stark effect, a time-dependent electric signal isconverted into a time-dependent shift of the transition energy. This shift ismeasured accurately by resonant ps laser spectroscopy with photocurrentdetection. In our experiments, we sample the laser synchronous output pulse ofan ultrafast CMOS circuit with high resolution. With our quantum dot sensordevice, we were able to sample transients below 20 ps with a voltage resolutionin the mV-range.

Optoelectronic sampling of ultrafast electric transients with single quantum dots