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A: Fachverband Atomphysik
A 3: Attosecond physics / Interaction with VUV and X-ray light
A 3.1: Hauptvortrag
Dienstag, 21. September 2021, 10:45–11:15, H1
Probing electronic wavefunctions and chiral structure using all-optical attosecond interferometry — •Michael Krüger1,2, Doron Azoury1, Omer Kneller1, Shaked Rozen1, Barry D. Bruner1, Alex Clergerie3, Bernard Pons3, Baptiste Fabre3, Yann Mairesse3, Oren Cohen2, Olga Smirnova4, and Nirit Dudovich1 — 1Department of Physics of Complex Systems, Weizmann Institute of Science, 76100 Rehovot, Israel — 2Department of Physics and Solid State Institute, Technion, 32000 Haifa, Israel — 3Université de Bordeaux, CNRS - CEA, CELIA, Talence, France — 4Max-Born-Institut, 12489 Berlin, Germany
Phase retrieval of electronic wavefunctions generated by photoionization has been a longstanding challenge. Here we measure the time-reversed process of photoionization – photorecombination – 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 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., Nature Photonics 13, 54 (2019).
[2] D. Azoury et al., Nature Photonics 13, 198 (2019).