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Projection phase contrast microscopy with a hard x-ray nanofocused beam: Defocus and contrast transfer
ISSN
1098-0121
Date Issued
2009
Author(s)
DOI
10.1103/PhysRevB.79.184112
Abstract
We report a projection phase contrast microscopy experiment using hard x-ray pink beam undulator radiation focused by an adaptive mirror system to 100-200 nm spot size. This source is used to illuminate a lithographic test pattern with a well-controlled range of spatial frequencies. The oscillatory nature of the contrast transfer function with source-to-sample distance in this holographic imaging scheme is quantified and the validity of the weak phase object approximation is confirmed for the experimental conditions.