Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.65: Poster

Friday, March 24, 2017, 09:30–13:00, P2-EG

Polarization Control of High Harmonics for Ultrafast Magnetic Imaging — •Christina Nolte¹, Sergey Zayko², Ofer Kfir^2,3, Sascha Schäfer², Daniel Steil¹, Birgit Hebler⁴, Manfred Albrecht⁴, Oren Cohen³, Stefan Mathias¹, and Claus Ropers² — ¹1st Physical Institute, University of Göttingen — ²4th Physical Institute, University of Göttingen — ³Physics Department, Technion, Israel — ⁴Institute of of Physics, University of Augsburg

The generation of circularly polarized extreme ultraviolet and soft X-ray radiation from high-harmonic light sources [1,2] in combination with lensless imaging techniques opens a new and powerful route for the spatially resolved study of ultrafast magnetization dynamics [3].

We utilize a stable and compact method of generating bright circularly polarized high harmonics [4] and extend the approach to tailor the radiation ellipticity by a precise control of recollision trajectories. We characterize the XUV polarization in two spectral regions (25-30 eV and 50-60 eV) using two methods: (i) polarization selective nanoscale waveguides [5] and (ii) magneto-optical activity in Co [1]. In addition, we present diffraction data and discuss current progress towards the imaging of magnetic structures.

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

[2] T. Fan et al., PNAS 112, 14206 (2015)

[3] S. Mathias et al., JESRP 189, 164 (2013)

[4] O. Kfir et al., Appl. Phys. Lett. 108, 211106 (2016)

[5] S. Zayko et al., Optica 3, 239 (2016)