Plasmonic Optoelectronic Memristor Enabling Fully Light‐Modulated Synaptic Plasticity for Neuromorphic Vision

Advanced Science

Chenyi Zhao¹  Shencheng Fu¹  Tao Zeng¹  Xinnong Wang¹  Xuanyu Shan¹  Zhongqiang Wang¹  Ya Lin¹  Haiyang Xu¹  Xintong Zhang¹  Yichun Liu¹  Xiaoning Zhao¹ 

[1] Center for Advanced Optoelectronic Functional Materials Research Key Laboratory for UV Light‐Emitting Materials and Technology (Northeast Normal University) Ministry of Education 5268 Renmin Street Changchun 130024 China;

关键词: AgTiO2 nanocomposite;    fully light‐modulated synaptic plasticity;    localized surface plasmon resonance (LSPR);    neuromorphic vision;    plasmonic optoelectronic memristors;   

DOI  :  10.1002/advs.202104632

来源: DOAJ

【 摘 要 】

Abstract Exploration of optoelectronic memristors with the capability to combine sensing and processing functions is required to promote development of efficient neuromorphic vision. In this work, the authors develop a plasmonic optoelectronic memristor that relies on the effects of localized surface plasmon resonance (LSPR) and optical excitation in an Ag–TiO2 nanocomposite film. Fully light‐induced synaptic plasticity (e.g., potentiation and depression) under visible and ultraviolet light stimulations is demonstrated, which enables the functional combination of visual sensing and low‐level image pre‐processing (including contrast enhancement and noise reduction) in a single device. Furthermore, the light‐gated and electrically‐driven synaptic plasticity can be performed in the same device, in which the spike‐timing‐dependent plasticity (STDP) learning functions can be reversibly modulated by visible and ultraviolet light illuminations. Thereby, the high‐level image processing function, i.e., image recognition, can also be performed in this memristor, whose recognition rate and accuracy are obviously enhanced as a result of image pre‐processing and light‐gated STDP enhancement. Experimental analysis shows that the memristive switching mechanism under optical stimulation can be attributed to the oxidation/reduction of Ag nanoparticles due to the effects of LSPR and optical excitation. The authors' work proposes a new type of plasmonic optoelectronic memristor with fully light‐modulated capability that may promote the future development of efficient neuromorphic vision.

【 授权许可】

Unknown