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Hannover 2020 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Attosecond physics II

A 11.1: Hauptvortrag

Dienstag, 10. März 2020, 14:00–14:30, f107

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 Dudovich11Department 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).

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