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

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Neuromorphic vision systems require efficient devices that integrate sensing and processing.
• Optoelectronic memristors offer a promising pathway for developing such systems.

Purpose of the Study:

• To develop a plasmonic optoelectronic memristor capable of combining visual sensing and image processing.
• To investigate light-induced synaptic plasticity for neuromorphic applications.

Main Methods:

• Fabrication of a plasmonic optoelectronic memristor using an Ag-TiO2 nanocomposite film.
• Demonstration of light-induced synaptic plasticity (potentiation and depression) using visible and ultraviolet light.
• Investigation of light-gated and electrically-driven spike-timing-dependent plasticity (STDP).

Main Results:

• The device exhibited fully light-induced synaptic plasticity, enabling visual sensing and low-level image pre-processing (contrast enhancement, noise reduction).
• Light-gated STDP was demonstrated, reversibly modulated by visible and UV light.
• High-level image recognition was achieved with enhanced accuracy due to pre-processing and light-gated STDP.

Conclusions:

• A novel plasmonic optoelectronic memristor with fully light-modulated capabilities was developed.
• The device integrates sensing and processing functions, advancing neuromorphic vision.
• The memristive switching mechanism is attributed to Ag nanoparticle oxidation/reduction driven by LSPR and optical excitation.