A Two-Terminal, Broadband, Low-Energy Optical Synaptic Device for Optical Encoding

In this work, we propose a two-terminal, broadband Pd/CuO1-x/ITO optical synapse with an ultra-low energy consumption of 42.5 fJ per operation. With a read voltage as low as 0.04 V, the optical synapse demonstrates light-dosage-tunable and wavelength-dependent synaptic plasticity. The light dosage tunable plasticity enables in-sensor optical temporal information encoding. Consequently, the two-terminal oxide-based optical synapse offers itself as an efficient solution for future neuromorphic vision processing systems with broadband photoresponse and exceptionally low energy consumption.