Optically-triggered deterministic spiking regimes in nanostructure resonant tunnelling diode-photodetectors
Ali Al-Taai, Qusay Raghib and Hejda, Matěj and Zhang, Weikang and Romeira, Bruno and Figueiredo, José M L and Wasige, Edward and Hurtado, Antonio (2023) Optically-triggered deterministic spiking regimes in nanostructure resonant tunnelling diode-photodetectors. Neuromorphic Computing and Engineering, 3 (3). 034012. ISSN 2634-4386 (https://doi.org/10.1088/2634-4386/acf609)
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Abstract
This work reports a nanostructure resonant tunnelling diode-photodetector (RTD-PD) device and demonstrates its operation as a controllable, optically-triggered excitable spike generator. The top contact layer of the device is designed with a nanopillar structure (500 nm in diameter) to restrain the injection current, yielding therefore lower energy operation for spike generation. We demonstrate experimentally the deterministic optical triggering of controllable and repeatable neuron-like spike patterns in the nanostructure RTD-PDs. Moreover, we show the device's ability to deliver spiking responses when biased in either of the two regions adjacent to the negative differential conductance region, the so-called 'peak' and 'valley' points of the current–voltage (I–V) characteristic. This work also demonstrates experimentally key neuron-like dynamical features in the nanostructure RTD-PD, such as a well-defined threshold (in input optical intensity) for spike firing, as well as the presence of spike firing refractory time. The optoelectronic and chip-scale character of the proposed system together with the deterministic, repeatable and well controllable nature of the optically-elicited spiking responses render this nanostructure RTD-PD element as a highly promising solution for high-speed, energy-efficient optoelectronic artificial spiking neurons for novel light-enabled neuromorphic computing hardware.
ORCID iDs
Ali Al-Taai, Qusay Raghib, Hejda, Matěj ORCID: https://orcid.org/0000-0003-4493-9426, Zhang, Weikang, Romeira, Bruno, Figueiredo, José M L, Wasige, Edward and Hurtado, Antonio ORCID: https://orcid.org/0000-0002-4448-9034;-
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Item type: Article ID code: 86755 Dates: DateEvent1 September 2023Published1 September 2023Published Online1 September 2023AcceptedSubjects: Science > Physics Department: Faculty of Science > Physics
Faculty of Science > Physics > Institute of PhotonicsDepositing user: Pure Administrator Date deposited: 22 Sep 2023 11:18 Last modified: 11 Nov 2024 14:04 URI: https://strathprints.strath.ac.uk/id/eprint/86755