Phase-Change Extraordinary Optical Transmission Metasurface for Reconfigurable Spatial Filtering

Optical analogue computing is attracting a lot of research attention due to some inherent advantages over digital electronic computing, advantages that include spatial parallelism, low-loss transmission and ultra-high bandwidth [1]. Both free-space and integrated photonic systems have been explored for uses such as optical neural networks [2] and parallelised matrix-vector multiplication [3]. The work presented here utilises a free-space configuration for reconfigurable optical image processing, in particular implementing dual-function reconfigurable low and high-pass filtering, with applications in edge-detection and blurring.