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(a) Experimental setup. The resonance of this microstrip resonator is shifted by varying dc bias applied to the SAQDs sample. This frequency shift is then sensed by the Schottky peak detector, by converting microwave power to voltage. (b) Resonance curves at different contact capacitance. The SAQDs sample is replaced by a varactor to allow determined capacitance tuning. The inset is a zoom-in image from 1550 to 1555 MHz, showing that frequency shifts will cause detectable voltage changes at fixed microwave frequencies. The frequency sensitivity is determined to be 3.3 MHz/fF in this region.
Low frequency curve. Two states and are located at −1.365 and −1.165 V. states are degenerated due to SAQDs size dispersion and number of dots probed. The inset shows the band diagram of the SAQDs.
(a) Differential curve obtained by lock-in detecting the ac modulation frequency. This curve shows the slope of conventional curve. The inset shows the differential resonance curve of the resonator. The arrow indicates the working frequency 1650 MHz chosen in this experiment. (b) curve recovered by integrating the curve in (a).
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