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Journal Article

Second-Harmonic Generation from Critically Coupled Surface Phonon Polaritons

MPS-Authors
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Passler,  Nikolai
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Razdolski,  Ilya
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Gewinner,  Sandy
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Schöllkopf,  Wieland
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Paarmann,  Alexander
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Fulltext (public)

1702.03705.pdf
(Preprint), 4MB

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Citation

Passler, N., Razdolski, I., Gewinner, S., Schöllkopf, W., Wolf, M., & Paarmann, A. (2017). Second-Harmonic Generation from Critically Coupled Surface Phonon Polaritons. ACS Photonics, 4(5), 1048-1053. doi:10.1021/acsphotonics.7b00118.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-7B75-A
Abstract
Mid-infrared nanophotonics can be realized using subdiffractional light localization and field enhancement with surface phonon polaritons in polar dielectric materials. We experimentally demonstrate second-harmonic generation due to the optical field enhancement from critically coupled surface phonon polaritons at the 6H-SiC−air interface, employing an infrared free-electron laser for intense, tunable, and narrowband mid-infrared excitation. Critical coupling to the surface polaritons is achieved using a prism in the Otto geometry with adjustable width of the air gap, providing a contact-free access to the polariton dispersion with full control over the excitation conditions. The calculated reflectivity and second-harmonic spectra reproduce the complete experimental data set with high accuracy, allowing for a quantification of the optical field enhancement. We also reveal the mechanism for low out-coupling efficiency of the second-harmonic light in the Otto geometry. Perspectives on surface phonon polariton-based nonlinear sensing and nonlinear waveguide coupling are discussed.