Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Plasmonics and Nanooptics II: Light-Matter Interaction

HL 23.3: Vortrag

Montag, 20. März 2017, 15:30–15:45, TRE Ma

Second Harmonic Generation from Surface Phonon Polaritons in Silicon Carbide — •Nikolai Christian Paßler, Ilya Razdolski, Martin Wolf, and Alexander Paarmann — Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin

Surface Phonon Polaritons (SPhP) have recently emerged as novel building block for mid-infrared (MIR) nanophotonic applications, promising to possibly overcome the intrinsic loss problem of plasmonics [1]. SPhPs arise in polar dielectrics due to optical phonon resonances leading to negative permittivity between transverse and longitudinal optical phonon frequencies. Furthermore, SPhPs exhibit tremendous field enhancements, driving the lattice atoms into a strongly non-linear regime. Hence, SPhPs might grant a frequency-tunable access to vibrational-driven transient transitions of material phases.

Here, we use linear and nonlinear MIR spectroscopy [2], revealing the resonant second harmonic generation (SHG) arising from propagating SPhPs in SiC in the Otto geometry. Our experiments employ intense, tunable and narrowband MIR pulses from a free-electron laser. Corresponding to the absorption dip in our reflectivity spectra, we observe a strongly enhanced SHG yield at the SPhP resonance. Furthermore, we develop a matrix formalism for anisotropic multilayer wave propagation, allowing for precise prediction of the linear and non-linear properties of SPhPs.

[1] Caldwell et al., Nano Letters (2014) [2] Paarmann et al., APL (2015)