Light-Controlled Threshold Switching Memristive Neuron Devices for Color Photoreceptor

Neuromorphic photoreceptors have been extremely beneficial in developing high energy-efficient intelligent systems. There is a strong need for electron devices to mimic the photoreceptors that could recognize the coloring information. Herein, we propose a wavelength dependent light tunable threshold switching memristive neuron devices based on Ta2O5:Ag nanocomposites. The threshold voltage of the device can be accurately controlled by light stimulation of different wavelength. The physical mechanism could be attributed to the effects of localized surface plasmon resonance (LSPR) effect. Moreover, the artificial leaky integrate and fire (LIF) neurons based on the memristive devices can directly convert light signal into spike sequence according to the light wavelength. Then, the color photoreceptor is finally realized based on the wavelength dependence of the neuronal spike rates.