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arXiv · 1607.05158

Resonant enhancement of second harmonic generation in the mid-infrared using localized surface phonon polaritons in sub-diffractional nanostructures

Ilya Razdolski·Yiguo Chen·Alexander J. Giles·Sandy Gewinner·Wieland Schöllkopf·Minghui Hong·Martin Wolf·Vincenzo Giannini·Joshua D. Caldwell·Stefan A. Maier·Alexander Paarmann
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Abstract

We report on strong enhancement of mid-infrared second harmonic generation (SHG) from SiC nanopillars due to the resonant excitation of localized surface phonon-polaritons within the Reststrahlen band. The magnitude of the SHG peak at the monopole mode experiences a strong dependence on the resonant frequency beyond that described by the field localization degree and the dispersion of linear and nonlinear-optical SiC properties. Comparing the results for the identical nanostructures made of 4H and 6H SiC polytypes, we demonstrate the interplay of localized surface phonon polaritons with zone-folded weak phonon modes of the anisotropic crystal. Tuning the monopole mode in and out of the region where the zone-folded phonon is excited in 6H-SiC, we observe a prominent increase of the already monopole-enhanced SHG output when the two modes are coupled. Envisioning this interplay as one of the showcase features of mid-infrared nonlinear nanophononics, we discuss its prospects for the effective engineering of nonlinear-optical materials with desired properties in the infrared spectral range.

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Ilya Razdolski, Yiguo Chen, Alexander J. Giles, Sandy Gewinner, Wieland Schöllkopf, Minghui Hong, Martin Wolf, Vincenzo Giannini, Joshua D. Caldwell, Stefan A. Maier, Alexander Paarmann. 2016-07-19. Resonant enhancement of second harmonic generation in the mid-infrared using localized surface phonon polaritons in sub-diffractional nanostructures. https://doi.org/10.1021/acs.nanolett.6b03014

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