# Simultaneous summation and recognition effects for a dual-emitter light-induced neuromorphic device

## TL;DR

This paper presents a dual-emitter light-induced neuromorphic device that demonstrates simultaneous spatial and temporal summation effects, mimicking neural integration with potential applications in neuromorphic computing.

## Contribution

The study introduces a novel dual-emitter InGaN MQW-diode device capable of concurrent spatial and temporal summation, advancing neuromorphic device functionalities.

## Key findings

- Experimental confirmation of temporal summation enhancing spatial summation.
- Resonant summation observed at specific input periods.
- Device exhibits sophisticated spatiotemporal EPSV summation behavior.

## Abstract

We propose and fabricate a dual-emitter light-induced neuromorphic device composed of two light-induced devices with a common collector and base. Two InGaN multiple quantum well diodes (MQW-diodes) are used as the emitters to generate light, and one InGaN MQW-diode is used as the common collector to absorb the emitted light. When the presynaptic voltages are synchronously applied to the two emitters, the collector demonstrates an adding together of the excitatory post synaptic voltage (EPSV). The width and period of the two input signals constitute the code to generate spatial summation and recognition effects at the same time. Experimental results confirm that temporal summation caused by the repetitive-pulse facilitation could significantly strengthen the spatial summation effect due to the adding together behavior when the repetitive stimulations are applied to the two emitters in rapid succession. Particularly, the resonant summation effect occurs at the co-summation region when the two repetitive-pulse signals have a resonant period, which offers a more sophisticated spatiotemporal EPSV summation function for the dual-emitter neuromorphic device.

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Source: https://tomesphere.com/paper/1705.01096