Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 12: Ultrafast Electron and spin dynamics at interfaces II
O 12.7: Invited Talk
Monday, March 12, 2018, 16:45–17:15, MA 005
Nonlinear Surface Phonon Polariton Spectroscopy — Nikolai C. Passler1, •Ilya Razdolski1, Christopher J. Winta1, Sandy Gewinner1, Wieland Schöllkopf1, Stefan A. Maier2, Joshua D. Caldwell3, Martin Wolf1, and Alexander Paarmann1 — 1Fritz-Haber-Institut, Berlin, Germany — 2Imperial College London, UK — 3Vanderbilt University, Nashville, USA
There has been much increasing interest recently in the mid-infrared to terahertz spectral response of polar dielectric crystals due to a novel branch of nanophotonics based on surface phonon polaritons (SPhPs) [1], which arise at the surface of these materials due to optical phonon resonances in their dielectric response. Using our in-house free-electron laser [2] as intense and tunable infrared light source, we have developed new approaches of nonlinear solid state spectroscopy, focusing on phonon resonances in polar dielectrics.
Specifically, mid-infrared second harmonic generation (SHG) spectroscopy [3] is used to probe the optical field enhancement associated with resonantly excited SPhPs in sub-diffractional nanostructures [4], as well as prism-coupled propagating SPhPs using the Otto geometry [5]. The latter approach enables mapping of the full SPhP dispersion which can, for instance, reveal the SPhP hybridization in heterostructures.
[1] Caldwell, et al. Nanophotonics 4, 1 (2015) [2] Schöllkopf et al., Proc. SPIE 9512, 95121L (2015) [3] Paarmann, et al. Appl. Phys. Lett. 107, 081101 (2015) [4] Razdolski, et al., Nano Letters 16, 6954 (2016) [5] Passler, et al., ACS Photonics 4, 1048 (2017)