Zernike Zone Plates

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Zernike phase contrast has been demonstrated using both a positive zernike zone plate
(PZZP) and a negative zernike zone plate (NZZP) at the coherent soft x-ray test station. Images of a Cr test sample are shown in Fig. 2 with the corresponding zone plate used. Both contrast enhancement in the case of the PZZP and contrast reversal in the case of the NZZP were demonstrated.

Fig 2. (a) SEM images of a regular zone plate (RZP), positive zernike zone plate (PZZP), and negative zernike zone plate (NZZP) along with corresponding images of a chromium grating test sample (b). Lineouts are shown on the graph to the right. (Click on an image to view the full-size version)