All-optically controlled artificial synaptic device based on PZT photochromism for biomimetic visual memory imaging systems

Abstract

Neuromorphic vision systems are critical for high-efficiency edge intelligence, yet mainstream electrically controlled synaptic devices suffer from irreversible ion migration and poor biomimetic imaging capability. Herein, we propose an all-optically controlled artificial synaptic device based on the photochromic effect of lead zirconate titanate ceramics. By adopting an asymmetric strategy of 395 nm ultraviolet light writing and 808 nm infrared light erasing, it simulates biological synapses’ bidirectional plasticity. A biomimetic visual memory imaging system was further constructed, which exhibits long-term paired-pulse facilitation (PPF) beyond short-term plasticity. The PPF index (18%–85%) is flexibly tunable via pulse interval, duration, and background light intensity, realizing dynamic imaging that mimics the brain's memory-forgetting-reconsolidation process. This all-optical scheme offers a highly programmable platform for biomimetic visual systems integrating sensing, memory, and computation.