Regensburg 2016 – scientific programme

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MI: Fachverband Mikrosonden

MI 3: X-ray Imaging, Holography, Ptychography and Tomography

MI 3.5: Talk

Wednesday, March 9, 2016, 11:45–12:00, H5

Holography-guided ptychography with soft X-rays — •Piet Hessing¹, Bastian Pfau³, Erik Guehrs², Michael Schneider², Laura Shemilt², Jan Geilhufe¹, and Stefan Eisebitt¹ — ¹Max-Born-Institut, Berlin, Germany — ²TU Berlin, Berlin, Germany — ³Lund University, Lund, Sweden

We present a novel combination of two coherent imaging methods, namely holography [1,2] and ptychography [3,4] for imaging nanoscale objects using soft X-rays. Ptychography as a scanning imaging method relies on the exact knowledge (or post-experimental retrieval) of the position of the X-ray illumination on the sample during scanning. Our method combination allows to directly encode the scan positions in the diffraction pattern without the need of accurate position encoders. We demonstrate that holographically encoded positions significantly reduce the experimental and numerical requirements. Our ptychographic reconstructions cover a large field of view with diffraction-limited resolution and high sensitivity in the reconstructed phase shift and absorption of the objects.

[1] S. Eisebitt et al., Nature 432, 885 (2004). [2] B. Pfau and S. Eisebitt, X-ray holography, in: Synchrotron Light Sources and Free-Electron lasers (Springer, 2015). [3] K. Giewekemeyer et al., Opt. Express 19, 1037 (2011). [4] M. Rose et al., J. Synchrotron Rad. 22, 819 (2015).