Ptychographic Imaging at the Swiss Light Source

Author： Menzel Andreas Diaz Ana Guizar-Sicairos Manuel

ISSN： 0894-0886

Source： Synchrotron Radiation News, Vol.26, Iss.2, 2013-03, pp. : 26-31

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Abstract

One of the high-resolution X-ray microscopy techniques currently being developed at the Swiss Light Source (SLS), as in other places, is based on ptychographic imaging. Ptychography is a coherent diffractive imaging (CDI) technique that bypasses the need for high-numerical-aperture X-ray optics by “phasing” diffraction patterns [1]. Measured in the Fraunhofer far field, the intensity distribution of coherent light scattered by a specimen is easily related to the wave field directly past the specimen by little more than a Fourier transform. However, only intensities are measurable, and the all-important phase information needs to be “retrieved” through analytical means. CDI is insensitive to aberrations and manufacturing limitations of optics and can yield highly resolved images with quantitatively interpretable contrast.