All‐Optically Controlled Polarization‐Sensitive Memristors: A Unified Platform for Motion Feature Extraction

ABSTRACT All‐optically controlled polarization‐sensitive memristors offer a promising route toward compact and efficient neuromorphic vision hardware by unifying polarized light sensing and synaptic computing within a single device. However, most reported polarization‐sensitive neuromorphic systems still rely on electrical signals for synaptic modulation, limiting true all‐optical operation and increasing system complexity. Here, we propose an all‐optically controlled polarization‐sensitive memristor based on an Au nanoparticle/WSe 2 nanobelt heterojunction, which serves as a unified platform for motion feature extraction. The device exhibits not only angle‐dependent synaptic behavior but also polarization‐sensitive, reversible, and fully optical synaptic modulation, attributed to the surface plasmon resonance (SPR) of Au nanoparticles and the optical excitation of WSe 2 . Utilizing all‐optical polarization‐dependent synaptic plasticity, dynamic encryption of image information is achieved using 532 and 320 nm laser illumination. Furthermore, polarization‐state‐dependent convolutional kernels allow effective extraction of motion‐related features, leading to enhanced handwriting recognition accuracy under noisy conditions and enabling polarization‐assisted moving object detection. This work demonstrates that all‐optically controlled polarization‐sensitive memristors can function as a unified hardware platform for motion feature extraction, paving the way for advanced polarization‐sensitive neuromorphic vision systems.