Regensburg 2016 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

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

MI 3.6: Vortrag

Mittwoch, 9. März 2016, 12:00–12:15, H5

Polarization contrast of nanoscale waveguides studied by coherent diffractive imaging with high-harmonic source — •Sergey Zayko, Murat Sivis, Sascha Schäfer, and Claus Ropers — 4th Physical Institute - Solids and Nanostructures, University of Göttingen, 37077 Göttingen

Recently proposed high harmonic generation (HHG) schemes offer novel means of control over the polarization state of the emitted radiation, enabling ultrafast table-top implementations of polarization-dependent spectroscopy, such as circular dichroism [1-4]. Here, we present a novel approach to analyze and control the polarization state in the case of extreme ultraviolet radiation via nanoscale waveguides. Using coherent diffractive imaging (CDI), we experimentally study the propagation of high harmonics through nanoscale slab waveguides with optically dense cladding materials and find a strong dependence of the waveguide transmission on the incident light polarization [5]. Employing such waveguides, we demonstrate a novel type of high harmonic polarizer and design a scheme to analyze the polarization state of extreme ultraviolet radiation by means of single image acquisition. Our results on polarization sensitive CDI highlight the potential of HHG sources for ultrafast magnetic imaging.

[1] O. Kfir et al., Nature Photonics 9, 99-105 (2015).

[2] G. Lambert et al., Nature Communications 6, 6167 (2015).

[3] A. Ferré et al., Nature Photonics 9, 93-98 (2015).

[4] D. Hickstein et al.,, Nature Photonics 9, 743-750 (2015).

[5] S. Zayko et al., Optics Express 23, 19911-19921 (2015).