Scatter Ptychography

Qian Huang, Zhipeng Dong, Yuzuru Takashima, Timothy J Schulz, David J Brady

Abstract: Coherent illumination reflected by a remote target may be secondarily scattered by intermediate objects or materials. Here we show that phase retrieval on remotely observed images of such scattered fields enables imaging of the illuminated object at resolution proportional to λRs/As, where Rs is the range between the scatterer and the target and As is the diameter of the observed scatter. This resolution may exceed the resolution of directly viewing the target by the factor RcAs/RsAc, where Rc is the range between the observer and the target and Ac is the observing aperture. Here we use this technique to demonstrate ≈ 32× resolution improvement relative to direct imaging.