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O: Fachverband Oberflächenphysik
O 96: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy II
O 96.7: Vortrag
Freitag, 21. März 2025, 12:00–12:15, H4
Collective Behavior of SiC Phonon Polariton Resonators — •Richarda Niemann1,2, Sören Wasserroth1, Guanyu Lu2, Christopher R. Gubbin3, Martin Wolf1, Simone de Liberato3, Joshua D. Caldwell2, and Alexander Paarmann1 — 1Fritz Haber Institute, Berlin, Germany — 2Vanderbilt University, Nashville, TN, USA — 3University of Southampton, Southampton, UK
Structuring polar materials with microresonators enables light confinement to sub-wavelength scales and the emergence of localized phonon polaritons (PhPs). Previous studies on PhP single resonators and 2D resonator arrays investigated the coupling behavior of resonators with their surrounding [1,2]. Here, we bridge the gap between a single resonator and a 2D array by studying subdiffractional SiC microresonators on a SiC substrate in 1D arrays with sumfrequency generation (SFG) spectro-microscopy [3,4]. The high spatial resolution on the order of the lateral size of the microresonators allows us an in-depth analysis of the build-up of collective modes in 1D arrays with sizes from one to several resonators. We observe different optical responses for in-phase and out-of-phase excitation showing the importance of phase relationships for coupling between the resonators. By investigating arrays with different periods, we gain information about the coupling mechanisms.
[1] Gubbin et al., Phys. Rev. B, 95 (2017)
[2] Chen et al., ACS Photonics, 1 (2014)
[3] Niemann et al., Appl. Phys. Lett. 120, 131102 (2022)
[4] Niemann et al., Adv. Mater. 2024, 36, 2312507
Keywords: sum-frequency generation; microscopy; nanostructures; phonon polaritons