Lateral position correction in ptychography using the gradient of intensity patterns

Highlights: • New method to correct the probe position in ptychography is proposed. • This method can correct the probe position with sub-pixel accuracy. • Less computationally expensive than other existing methods. • It is straightforward to implement. • Results with visible light experimental data are shown. - Abstract: Ptychography, a form of Coherent Diffractive Imaging, is used with short wavelengths (e.g. X-rays, electron beams) to achieve high-resolution image reconstructions. One of the limiting factors for the reconstruction quality is the accurate knowledge of the illumination probe positions. Recently, many advances have been made to relax the requirement for the probe positions accuracy. Here, we analyse and demonstrate a straightforward approach that can be used to correct the probe positions with sub-pixel accuracy. Simulations and experimental results with visible light are presented in this work.