Fig. 2: Characterization of the optoelectronic spiking afferent nerve.
From: Tactile sensory coding and learning with bio-inspired optoelectronic spiking afferent nerves
a I–V curves of the MXene-based pressure sensor with applied pressures from 0 to 200 kPa. b Resistance and resistance change ratio in response to an increasing pressure. c Output frequency and amplitude of the pressure-dependent ADC for an increasing pressure up to 100 kPa. The insert shows the analog-to-digital conversion of electrical signals in the ADC. d I–t curve of the synaptic photomemristor with optical pulses as stimuli, showing current spikes and persistent photoconductivity (PPC) in response to the optical pulses. e Optical paired pulse facilitation (PPF) or neural facilitation behavior with respect to current spiking induced by optical spiking. f Spike-rate-dependent plasticity (SRDP) behavior with respect to PPC induced by optical spiking. g Input–output of the system showing the correlation among pressures, ADC outputs, and post-synaptic currents (PSCs). With increasing pressure, both the frequency of the PSC (h) and the weight change Δw (i) increase. The error bars indicate variations during repeated measurements.
