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O: Fachverband Oberflächenphysik
O 58: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy I
O 58.6: Talk
Wednesday, March 29, 2023, 16:30–16:45, WIL A317
Resonant imaging of infrared light confinement using phonon polaritons in sub-diffractional 4H-SiC nanostructures — •Richarda Niemann1, Sören Wasserroth1, Guanyu Lu2, Christopher R. Gubbin3, Martin Wolf1, Simone de Liberato3, Joshua D. Caldwell2, and Alexander Paarmann1 — 1Fritz Haber Institute of the Max Planck Society, Berlin, Germany — 2Vanderbilt University, Nashville, USA — 3University of Southampton, UK
Confinement of light to deeply sub-wavelength scales can be achieved using polaritons spatially confined to sub-diffractional nanostructures. Next to well-established plasmon polariton approaches, phonon polaritons supported in nanostructures made from polar dielectric crystals are a promising tool for the infrared spectral range [1].
Here, we study localized phonon polariton resonances in sub-diffractional 4H-SiC nanostructures using infrared super-resolution sum-frequency generation (SFG) microscopy [2], employing our institute's infrared free-electron laser [3]. With this technique we achieve high sensitivity to optical field enhancement associated with the spatial confinement of light. Simultaneously it is providing sub-diffractional imaging resolution, naturally enabling to study polaritons on their intrinsic length scales.
[1] Gubbin et al., Journal of Appl. Phys. 131, 030901 (2022)
[2] Niemann et al., Appl. Phys. Lett. 120, 131102 (2022)
[3] Schöllkopf et al., Proc. SPIE 9512, 95121L (2015)