Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 15: Attosecond physics
A 15.4: Talk
Wednesday, March 13, 2019, 11:30–11:45, S HS 3 Physik
Probing of electronic wavefunctions and chiral structure by all-optical attosecond interferometry — Doron Azoury1, Omer Kneller1, Shaked Rozen1, Barry D. Bruner1, Alex Clergerie2, Bernard Pons2, Baptiste Fabre2, Yann Mairesse2, Oren Cohen3, •Michael Krüger1, and Nirit Dudovich1 — 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel — 2Universite de Bordeaux - CNRS - CEA, CELIA, Talence, France — 3Department of Physics and Solid State Institute, Technion, Haifa, Israel
Phase retrieval of electronic wavefunctions generated by photo-ionization has been a long-standing challenge. Here we measure the time-reversed process of photo-ionization -- photo-recombination -- in attosecond pulse generation. We demonstrate all-optical interferometry of two independent phase-locked attosecond light sources [1]. Our measurement enables us to directly determine the phase shift associated with electron scattering and with structural minima in simple atomic systems.
In a second study, we superimpose two attosecond light sources with perpendicular polarization, achieving direct time-domain polarization control [2]. We establish an extreme-ultraviolet lock-in detection scheme, allowing the isolation and amplification of weak chiral signals. We demonstrate our scheme by a phase-resolved measurement of magnetic circular dichroism.
[1] D. Azoury et al., arXiv:1810.05021, Nature Photonics in press.
[2] D. Azoury et al., accepted for publication in Nature Photonics.