Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Poster II

MA 31.17: Poster

Mittwoch, 19. März 2025, 17:00–19:30, P1

Towards ultrafast time-resolved SHG imaging of ferroic materials — •Andrin Caviezel, Gerrit Horstmann, Thomas Lottermoser, and Manfred Fiebig — Department of Materials, ETH Zurich, Zurich, Switzerland

Ferroic materials enable the storage and manipulation of information within their domain structures, a fundamental property underpinning their technological potential. Second-harmonic generation (SHG) imaging is a well-established method for probing ferroic domain patterns at equilibrium, while optical excitation with femtosecond laser pulses holds promise for achieving ultrafast domain switching. However, studying the non-equilibrium dynamics of ferroic domains demands an imaging technique that offers both high temporal and spatial resolution. In this work, we present an ultrafast time-resolved SHG imaging setup designed specifically to investigate non-equilibrium dynamics in ferroic materials. By utilizing the high pulse energies of an amplified laser system, our setup enables direct wide-field imaging of ferroic structures. Additionally, the ability to tune the laser wavelength and employ sequences of pump pulses provides precise control over optical excitation conditions. This approach allows us to study ultrafast processes both in bulk ferroics with microscopic domain structures and micrometer-sized flakes of van der Waals ferroics under cryogenic conditions, advancing our understanding of their dynamic behavior.

Keywords: Second harmonic generation (SHG); Non-linear imaging; Ultrafast dynamics; Ferroic materials