Dynamic Imaging Using Ptychography

Dynamic imaging using ptychography.

We demonstrate through experiment an example of "mixed state" reconstruction using x-ray ptychography. We demonstrate successful imaging of a vibrating sample that has dynamics that are of one order magnitude faster than the measurement times. We show how increased vibrational amplitude leads to an increased population of illumination modes, a characteristic of partial coherence. Implications o...

Sub-diffraction Imaging Using Fourier Ptychography and Structured Sparsity

We consider the problem of super-resolution for sub-diffraction imaging. We adapt conventional Fourier ptychographic approaches, for the case where the images to be acquired have an underlying structured sparsity. We propose some subsampling strategies which can be easily adapted to existing ptychographic setups. We then use a novel technique called CoPRAM with some modifications, to recover sp...

High-dynamic-range coherent diffractive imaging: ptychography using the mixed-mode pixel array detector

Coherent (X-ray) diffractive imaging (CDI) is an increasingly popular form of X-ray microscopy, mainly due to its potential to produce high-resolution images and the lack of an objective lens between the sample and its corresponding imaging detector. One challenge, however, is that very high dynamic range diffraction data must be collected to produce both quantitative and high-resolution images...

Single-shot ptychography & sparsity-based subwavelength ptychography

We overcome two major limitations in ptychography – a powerful scanning-based coherent diffraction imaging technique. We demonstrate single-shot ptychography, overcoming the scanning-limited temporal resolution and also demonstrate sparsity-based subwavelength ptychography, overcoming the Abbe spatial resolution limit. OSCI: Phase retrieval: 100.5070; Scanning microscopy: 180.5810; Computationa...

Imaging of highly inhomogeneous strain field in nanocrystals using x-ray Bragg ptychography: A numerical study