Reversible optical switching memristors with tunable STDP synaptic plasticity: a route to hierarchical control in artificial intelligent systems

Jaafar, Ayoub H.; Gray, Robert J.; Verrelli, Emanuele; O'Neill, Mary; Kelly, Stephen. M.; Kemp, Neil T.

Abstract

© 2017 The Royal Society of Chemistry. Optical control of memristors opens the route to new applications in optoelectronic switching and neuromorphic computing. Motivated by the need for reversible and latched optical switching we report on the development of a memristor with electronic properties tunable and switchable by wavelength and polarization specific light. The device consists of an optically active azobenzene polymer, poly(disperse red 1 acrylate), overlaying a forest of vertically aligned ZnO nanorods. Illumination induces trans-cis isomerization of the azobenzene molecules, which expands or contracts the polymer layer and alters the resistance of the off/on states, their ratio and retention time. The reversible optical effect enables dynamic control of a memristor's learning properties including control of synaptic potentiation and depression, optical switching between short-term and long-term memory and optical modulation of the synaptic efficacy via spike timing dependent plasticity. The work opens the route to the dynamic patterning of memristor networks both spatially and temporally by light, thus allowing the development of new optically reconfigurable neural networks and adaptive electronic circuits.

Citation

Jaafar, A. H., Gray, R. J., Verrelli, E., O'Neill, M., Kelly, S. M., & Kemp, N. T. (2017). Reversible optical switching memristors with tunable STDP synaptic plasticity: a route to hierarchical control in artificial intelligent systems. Nanoscale, 9(43), 17091-17098. https://doi.org/10.1039/c7nr06138b

• Journal Article Type: Article
• Acceptance Date: Oct 23, 2017
• Online Publication Date: Oct 24, 2017
• Publication Date: Nov 21, 2017
• Deposit Date: Oct 31, 2017
• Publicly Available Date: Jan 19, 2018
• Journal: Nanoscale
• Print ISSN: 2040-3364
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 43
• Pages: 17091-17098
• DOI: https://doi.org/10.1039/c7nr06138b
• Keywords: Memristor; Optical; ZnO nanorod; Azobenzene; Resistive memory; Synaptic plasticity
• Public URL: https://hull-repository.worktribe.com/output/456146
• Publisher URL: http://pubs.rsc.org/en/Content/ArticleLanding/2017/NR/C7NR06138B#!divAbstract
• Additional Information: This is the accepted manuscript of an article published in Nanoscale, 2017. The version of record is available at the DOI link in this record.:
• Contract Date: Oct 31, 2017