Nikolai Christian Passler, Ilya Razdolski, Sandy Gewinner, Wieland Schöllkopf, Simone De Liberato, Christopher Gubbin, Joshua Caldwell, Martin Wolf, and Alexander Paarmann:
In: Quantum Nano-Photonics. NATO 2017. NATO Science for Peace and Security Series B: Physics and Biophysics.
eds.: Di Bartolo B., Silvestri L., Cesaria M., Collins J.,
publ.: Springer, Dordrecht;
NATO 2017: Quantum Nano-Photonics, 425-426 (2018), pp 2; ;
Analogous to surface plasmon polaritons in metals, polar dielectrics support surface phonon polaritons (SPhP) in the mid infrared (MIR) spectral region. In contrast to their plasmonic counterpart, however, SPhPs exhibit much longer lifetimes, and hence constitute a promising alternative in the development of nanophotonics. Employing an MIR free-electron laser, we here experimentally reveal resonant second harmonic generation from SPhPs, excited in the Otto geometry for prism coupling. In a second system featuring an ultrathin layer on top of the SPhP active material, we observe strong coupling of the bulk SPhP to the epsilon near zero mode supported by the thin layer. Our experimental findings are corroborated using a specifically developed matrix formalism for anisotropic multilayer wave propagation.
The original publication is available by link DOI: 10.1007/978-94-024-1544-5_44