Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 77: Poster: Plasmonics and Nanooptics

O 77.11: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Grating Coupling to Surface Phonon Polaritons with an Infrared Free-Electron Laser — •Marcel Kohlmann, Nikolai C. Passler, Martin Wolf, and Alexander Paarmann — Fritz-Haber-Institut der Max-Planck-Gesellschaft

When coupling infrared electromagnetic waves and optical phonons at the surface of a polar dielectric material, surface phonon polaritons (SPhPs) can be created within the Reststrahlen band between transversal and longitudinal optical phonons. SPhPs have a longer lifetime than surface plasmon polaritons (SPPs) which makes them promising candidates to overcome the loss problems assocciated with the short life times of SPPs. Since surface polaritons are non-radiative large momentum states, they cannot be excited from free space, but instead require nanostructures[1], prisms[2] or gratings[3] to provide the extra momentum.

Here we use gratings etched into a SiC surface to excite propagating SPhPs with a infrared free electron laser. Reflectance measurements are employed to optimize the SPhP excitation efficiency of the grating structures. Finally, we probe the resonant light emission from a second grating of different period of well-defined distance from the first grating to investigate the propagation of the SPhPs at a flat surface.

[1] Razdolski et al., Nano Lett. 16, 6954 (2016)

[2] Passler et al., ACS Photonics 4, 1048 (2017)

[3] Hafeli et al., J. Appl. Phys. 110, 043517 (2011)