Reconfigurable optical matrix operations based on GST superlattice microring array

This paper presents a reconfigurable matrix operations for optical digital computing using microring resonator (MMR) array assisted by ZnS-SiO_₂/Ge_₂Sb_₂Te_₅ superlattice (GST-SL) phase-change material (PCM). By overlaying the GST-SL onto the MMR array, the resonant state of each MMR element can be adjusted according to the assigned matrix weights, thereby modifying the optical matrix transfer function to yield specific logical operations. This device combines both nonlinear and linear operations to achieve the building blocks, including logic minterms and maxterms, for complex logic functions. Based on the basic logic units, combinational logic functions such as full addition and full subtraction have been numerically demonstrated. Our nanostructure reduces computational complexity and provides a basis for future array expansion, offering a promising new approach for integrated optical computing and optical signal processing.