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(a) Transient behavior of the mixed signal amplitude at fmix = 6 Hz for an electrical modulation of fel = 3 130 860 Hz and an optical modulation of fopt = 3130866 Hz; (b) the corresponding phase with the shutter open (= stable phase) and closed (gate voltage VG = 3 Vpp with an DC offset VDC = −2 V, drain–source bias of VDS = 10 mV, I–U gain 104, laser wavelength λlaser = 405 nm and irradiance Ee = 328 mW/mm2 (respectively, laser power Plaser = 10 mW)).
