Parallelized and Cascadable Optical Logic Operations by Few-Layer Diffractive Optical Neural Network

Optical computing has gained much attention due to its high speed, low energy consumption, and the fact that it is naturally parallelizable multiplexable, etc. Single-bit optical logic gates based on a four-hidden-layer diffractive neural network (DONN) have been demonstrated with paired apertures. Here, we show parallel-logic operation strategy two-hidden-layer DONN, showcasing their efficiency by multiple-bit (up 16-bit) (e.g., NAND) operations. In addition, demonstrate how NAND-DONN units can be utilized achieve NOR AND operations flipping cascading DONN.