Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 96: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy II
O 96.10: Talk
Friday, March 21, 2025, 12:45–13:00, H4
Sum-Frequency Generation Spectro-Microscopy in Barium Titante — •Dorothee Mader1, David Pesquera2, Saptam Ganguly2, Richarda Niemann1,3, Martin Wolf1, Sebastian F. Maehrlein1, Jose Santiso2, and Alexander Paarmann1 — 1Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 2Catalan Institute of Nanoscience and Nanotechnology, Barcelona, Spain — 3Vanderbilt University, Nashville, USA
Ferroelectric Barum Titanate (BTO) can be switched by excitation of phonons in the infrared (IR), enabeling the applications in future optical technologies.1 Here, we investigate the resonance behavior of BTO in the IR by employing infrared-visible (IR-VIS) sum-frequency generation (SFG) spectro-microscopy using the free-electron laser of the Fritz Haber Institute.2,3 As a second-order nonlinear technique, this method is sensitive to the material’s symmetry. Additionally, as it is employed resonantly, it can reveal vibrations, local structure and bonding of the material. We demonstrate resonant ferroelectric imaging using SFG spectro-microscopy for bulk BTO and 500 nm thin BTO membranes.
[1] M. Kwaaitaal et al., Nat. Photonics 82(3), 2731, (2024).
[2] R. Niemann et al., Appl. Phys. Lett. 120, 131102, (2022).
[3] D. Mader et al., J. Chem. Phys. 161, 094706 (2024).
Keywords: Sum-Frequency Generation; Barium Titanate; Spectro-Microscopy; Phonon; Nonlinear Optics