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Ptychographical imaging with partially saturated diffraction patterns

  • [设施]:神光Ⅱ
  • [期刊/会议名称]:Journal of Modern Optics
  • [摘要]:In ptychographical imaging with X-ray or electron beam, the recorded speckle intensity pattern of far field diffraction was often saturated by the presence of strong zeroth-order which was undesirable. A beam-stop was widely used to block the area of strong central diffraction in the pattern. The image was then reconstructed by disregarding the diffraction constraints within that area where inaccuracies exists due to saturation or blocking of the beam. Though reconstructions were obtained in this way by omitting saturation regions, the rationale behind this method was not discussed in detail and its effect on the final image quality was not studied. The physics of this method was analyzed theoretically and experimentally in this study. The convolution effect between illumination and object functions was able to retrieve and bring back the information lost in the blocked or saturated area from its neighborhood. This was possible while the saturated or blocked area was not wider than the spectral width of illumination, and once it exceeds this minimum, the quality of reconstruction would degrade seriously. The theoretical model was verified by numerical simulations and experiments.
  • [发表日期]:2015
  • [第一作者]:Xingchen Pan
  • [第一作者单位]:上海光机所
  • [通讯作者]:Xingchen Pan
  • [通讯作者单位]:上海光机所
  • [论文类型]:null
  • [期刊分类]:SCI4区
  • [学科分类]:物理
  • [影响因子]:1.008
  • [关键词]:phase measurement, phase retrieval, image reconstruction, coherence imaging
  • [卷号]:62
  • [期号]:15
  • [起止页码]: 1270-1277
  • [简介]: