Fig. 1

All-optical imaging through diffusers using diffractive surfaces. a Training and design schematic of a 4-layered diffractive system that can see through unknown/new randomly generated phase diffusers. b Sample images showing the image distortion generated by random diffusers. Top: input images. Second row: free-space propagation (FSP) of the input objects through the diffuser, without the diffractive layers, imaged at the output plane. Third row: the input objects imaged by an aberration-free lens through the diffuser. Fourth row: the outputs of the trained diffractive network. c Schematic of a 4-layered network trained to all-optically reconstruct the input field of view seen through an unknown random diffuser. d The photograph of the 3D printed network shown in c. e Schematic and photograph of the experimental apparatus used for testing the design shown in c using continuous wave coherent THz illumination