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O: Fachverband Oberflächenphysik

O 83: Poster Session - Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 83.9: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/EG

Nano-scale Analysis of Surface Phonon Polaritons in SrTiO₃ using a scattering-type Scanning Near-field Optical Microscope — •Daniel Wendland¹, Julian Barnett¹, Marc Rose², Felix Gunkel², Regina Dittmann², and Thomas Taubner¹ — ¹Institute of Physics (IA) RWTH Aachen — ²Peter Grünberg Institut, Forschungszentrum Jülich GmbH

Metasurfaces can arbitrarily manipulate light through resonant structures. Many metasurfaces are based on plasmonic materials, but phonon-based metasurfaces are on the rise, benefiting from the excitation of Surface Phonon Polaritons (SPhP) which can offer low losses and high propagation lengths [1]. SrTiO₃ (STO) could be an interesting candidate, because it supports strong phonon modes in its undoped state as well as nonvolatile resistive switching, which gives control over the local doping level. This switching process is reversible and could allow rewritable metasurfaces. To estimate the viability for SPhP-based resonator metasurfaces, we will investigate the SPhP behaviour in STO for different resonator geometries and doping levels. The latter allows us to gain a better understanding of plasmon-phonon-coupling [2], which is fundamental for this type of resonators. Here Scattering-type Scanning Near-field Optical Microscopy is applied to obtain nanoscale IR spectra and images. Using these results, we aim to predict the behaviour of STO resonator arrays and the viability of resistive switching for phonon-based metasurfaces.
[1] J. D. Caldwell et al., Nanophotonics, 4, 44 (2015)
[2] M. Lewin et al., Adv. Funct. Mater. 28, 1802834 (2018).