Programmable optical synaptic linking of neuromorphic photonic-electronic RTD spiking circuits
Hejda, Matěj and Zhang, Weikang and Al-Taai, Qusay Raghib Ali and Malysheva, Ekaterina and Owen-Newns, Dafydd and Figueiredo, José M. L. and Romeira, Bruno and Robertson, Joshua and Dolores-Calzadilla, Victor and Wasige, Edward and Hurtado, Antonio (2024) Programmable optical synaptic linking of neuromorphic photonic-electronic RTD spiking circuits. ACS Photonics, 11 (10). pp. 4279-4287. ISSN 2330-4022 (https://doi.org/10.1021/acsphotonics.4c01199)
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Abstract
Interconnectivity between functional building blocks (such as neurons and synapses) represents a fundamental functionality for realizing neuromorphic systems. However, in the domain of neuromorphic photonics, synaptic interlinking and cascadability of spiking optical artificial neurons remains challenging and mostly unexplored in experiments. In this work, we report an optical synaptic link between optoelectronic spiking artificial neurons based upon resonant tunneling diodes (RTDs) that allows for cascadable spike propagation. First, deterministic spiking is triggered using multimodal (electrical and optical) inputs in RTD-based spiking artificial neurons, which are optoelectronic (OE) circuits incorporating either micron-scale RTDs or photosensitive nanopillar-based RTDs. Second, feedforward linking with dynamical weighting of optical spiking signals between pre- and postsynaptic RTD artificial neurons is demonstrated, including cascaded spike activation. By dynamically weighting the amplitude of optical spikes, it is shown how the cascaded spike activation probability in the postsynaptic RTD node directly follows the amplitude of the weighted optical spikes. This work therefore provides the first experimental demonstration of programmable synaptic optical link and spike cascading between multiple fast and efficient RTD OE spiking artificial neurons, therefore providing a key functionality for photonic-electronic spiking neural networks and light-enabled neuromorphic hardware.
ORCID iDs
Hejda, Matěj ORCID: https://orcid.org/0000-0003-4493-9426, Zhang, Weikang, Al-Taai, Qusay Raghib Ali, Malysheva, Ekaterina, Owen-Newns, Dafydd, Figueiredo, José M. L., Romeira, Bruno, Robertson, Joshua, Dolores-Calzadilla, Victor, Wasige, Edward and Hurtado, Antonio ORCID: https://orcid.org/0000-0002-4448-9034;-
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Item type: Article ID code: 90706 Dates: DateEvent16 October 2024Published30 September 2024Published Online18 September 2024AcceptedSubjects: Science > Physics Department: Faculty of Science > Physics
Faculty of Science > Physics > Institute of PhotonicsDepositing user: Pure Administrator Date deposited: 25 Sep 2024 12:55 Last modified: 11 Nov 2024 14:27 URI: https://strathprints.strath.ac.uk/id/eprint/90706