Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 65: Nano-Optics and Biophotonics
Q 65.3: Talk
Friday, March 9, 2018, 11:00–11:15, K 0.023
Artifact-free XUV Coherence Tomography by one-dimensional phase retrieval — •Julius Reinhard1, Silvio Fuchs1,2, Martin Wünsche1,2, Jan Nathanael1, Johann Jakob Abel1, Felix Wiesner1, Christian Rödel2, and Gerhard Paulus1,2 — 1Institute of Optics and Quantumelectronics, Jena, Germany — 2Helmholtz Institute Jena, Germany
We report on major advances of XUV Coherence Tomography (XCT), which enable artifact-free three-dimensional imaging of nanoscale objects. XCT is the XUV equivalent of Optical Coherence Tomography (OCT). By using the broad bandwidth of high harmonics of femtosecond laser pulses (HHG) the axial resolution of XCT can reach a few nanometers [1]. However the typically modulated HHG spectra need to be transformed into a continuous spectrum by averaging HHG spectra generated with slightly different fundamental frequencies [2]. A challenge for XCT is the reconstruction of the sample structure from the measured intensity reflectivity, as the backtransform without knowledge of the phase information leads to artifacts in the reconstructed image. This problem has recently been addressed by implementing a novel one-dimensional phase retrieval algorithm, which has ultimately led to the artifact-free reconstruction of three dimensional samples [3].
[1] S. Fuchs et al., Scientific Reports 6, 20658 (2016)
[2] M. Wünsche et al., Optics Express 25, 6936 (2017)
[3] S. Fuchs et al. Optica 4, 903 (2017)