Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 72: Poster Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy
O 72.8: Poster
Mittwoch, 19. März 2025, 18:00–20:00, P2
Near-field Fano spectroscopy of MaPbI3 nanoparticles — Jinxin Zhan1, Tom Jehle1, Sven Stephan1, •Sam Nochowitz1, Ekaterina Tiguntseva2, Sergey Makarov2, Juanmei Duan1, Petra Groß1, and Christoph Lienau1 — 1Universität Oldenburg, D-26129, Germany — 2St. Petersburg, Russia
Semiconducting halide perovskite nanoparticles support Mie-type resonances that confine light on the nanoscale in localized modes with well-defined spatial field profiles yet unknown near-field dynamics. We introduce an interferometric scattering-type near-field microscopy technique [1] to probe the local electric field dynamics at the surface of a single MAPbI3 nanoparticle [2]. The amplitude and phase of the coherent light scattering from such modes are probed in a broad spectral range and with high spatial resolution. In the spectral domain, we uncover a Fano resonance with a 2π phase jump. In the near-field dynamics, this Fano resonance gives rise to a destructive interference dip after a few femtoseconds. Mie theory suggests that the interference between electric quadrupole and magnetic dipole modes of the particle, with spectra affected by resonant interband absorption of MAPbI3, lies at the origin of this effect [3]. Our results open up a new approach for probing local near-field dynamics of single nanoparticles. [1] Zhan, J., et al. Advanced Photonics 2020, 2 (04) [2] J. Zhan et al., Nano Lett. 2024 [3] Tiguntseva, E. Y., et al. Nano Lett. 2018, 18 (2), 1185-1190.
Keywords: sSNOM; Spectral Interferometry; Halide Perovskite nanoparticles; Mie resonances; Near field