Fig. 4: Principle of photo synapse and synaptic performance under photo stimulation of the s-OOST.

a Schematic structure of human visual system. b Schematic diagram of the s-OOSTs triggered by different light from UV to NIR. c Synaptic plasticity of s-OOST stimulated by single pulse with different pulse widths d Synaptic plasticity of s-OOST stimulated by two successive pulses with Δt = 1000 ms. e The filter effect at 0% strain. f The filter effect at 50% strain.