Holographic Imaging of a 3D Object Hidden behind a Diffuser or around a Corner

Introduction

Is there a way to see an object obscured by a strong diffuser such as a transmissive ground glass or a reflective opaque surface? Such a question has long been addressed in the context of inverse scattering problems [1], and a technique has been known that can detect a 2-D periodic grating structure hidden by a diffuser [2]. Recently a technique of ultrafast time-of-flight 3-D imaging that can look around a corner using diffusely reflected light was demonstrated [3]. Also a SLM-based technique that compensates the random phase and permits imaging a 3-D object through a diffuser has been reported [4].