Ayoub H. Jaafar
Percolation threshold enables optical resistive‐memory switching and light‐tuneable synaptic learning in segregated nanocomposites
Jaafar, Ayoub H.; O'Neill, Mary; Kelly, Stephen M.; Verrelli, Emanuele; Kemp, Neil T.
Professor Stephen Kelly S.M.Kelly@hull.ac.uk
Dr Emanuele Verrelli E.Verrelli@hull.ac.uk
Lecturer in Physics
Dr Neil Kemp N.Kemp@hull.ac.uk
Senior Lecturer in Physics
An optical memristor where the electrical resistance memory depends on the history of both the current flowing through the device and the irradiance of incident light onto it is demonstrated. It is based on a nanocomposite consisting of functionalized gold nanoparticles in an optically active azobenzene polymer matrix. The composite has an extremely low percolation threshold of 0.04% by volume for conductivity because of the aggregation of the conducting nanoparticles into filamentary nanochannels. Optical irradiation results in photomechanical switching through expansion of the thin film from above to below the percolation threshold, giving a large LOW/HIGH resistance ratio of 103. The device acts as an artificial synapse, the conductivity or plasticity of which can be independently modulated, either electrically or optically, to enable tunable and reconfigurable synaptic circuits for brain‐inspired artificial intelligent or visual memory arrays. The lifetime of the resistive‐memory states is also optically controllable, which enables spatial modulation of long‐ and short‐term memory.
|Journal Article Type||Article|
|Publication Date||Jul 1, 2019|
|Journal||Advanced Electronic Materials|
|Peer Reviewed||Peer Reviewed|
|Institution Citation||Jaafar, A. H., O'Neill, M., Kelly, S. M., Verrelli, E., & Kemp, N. T. (2019). Percolation threshold enables optical resistive‐memory switching and light‐tuneable synaptic learning in segregated nanocomposites. Advanced Electronic Materials, 5(7), https://doi.org/10.1002/aelm.201900197|
|Keywords||Electronic, Optical and Magnetic Materials|
This file is under embargo until May 29, 2020 due to copyright reasons.
Contact N.Kemp@hull.ac.uk to request a copy for personal use.
You might also like
Passive memristor synaptic circuits with multiple timing dependent plasticity mechanisms
An Optically-Programmable Absorbing Metasurface