Subsampled STEM-Ptychography

Ptychography has been shown to be an efficient phase contrast imaging technique for the scanning transmission electron microscope (STEM). STEM-ptychography uses a fast pixelated detector to collect a "4-dimensional" dataset consisting of a 2D electron diffraction pattern at every probe position of a 2D raster-scan. This 4D dataset can be used to recover the phase-image. Current camera technology, unfortunately, can only achieve a frame rate of a few thousand detector frames-per-second (fps), which means the acquisition time of the 4D dataset is up to 1000× slower than the scanning speed in a conventional STEM, thereby limiting the potential applications of this method for dose-fragile and dynamic specimens. In this letter, we demonstrate that subsampling provides an effective method for optimizing ptychographic acquisition by reducing both the number of detector-pixels and the number of probe positions. Subsampling and recovery of a the 4D data set is shown using an experimental 4D dataset with randomly removed detector-pixels and probe positions. After compressive sensing recovery, Wigner distribution deconvolution is applied to obtain phase-images. Randomly sampling both the probe positions and detector at 10% gives sufficient information for phase-retrieval and reduces acquisition time by 100×, thereby making STEM-ptychography competitive with conventional STEM.
Published in AIP Applied Physics Letters
Accepted Manuscript PDF


  1. The article you've shared here is fantastic because it provides some excellent information that will be incredibly beneficial to me. Thank you for sharing that. Keep up the good work. Precision Metal Casting Online

  2. Play Live Dealer Casino Games | JTM Hub
    Discover the 광주 출장안마 best live 고양 출장샵 dealer casino games 논산 출장마사지 including roulette, blackjack, video poker and much more! Get the best experience and 서산 출장안마 get 정읍 출장마사지 your bonus!


Post a Comment