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arXiv · 1811.12130

Third-harmonic generation in photonic topological metasurfaces

Daria Smirnova·Sergey Kruk·Daniel Leykam·Elizaveta Melik-Gaykazyan·Duk-Yong Choi·Yuri Kivshar
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Abstract

We study nonlinear effects in two-dimensional photonic metasurfaces supporting topologically-protected helical edge states at the nanoscale. We observe strong third-harmonic generation mediated by optical nonlinearities boosted by multipolar Mie resonances of silicon nanoparticles. Variation of the pump-beam wavelength enables independent high-contrast imaging of either bulk modes or spin-momentum-locked edge states. We demonstrate topology-driven tunable localization of the generated harmonic fields and map the pseudospin-dependent unidirectional waveguiding of the edge states bypassing sharp corners. Our observations establish dielectric metasurfaces as a promising platform for the robust generation and transport of photons in topological photonic nanostructures.

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Daria Smirnova, Sergey Kruk, Daniel Leykam, Elizaveta Melik-Gaykazyan, Duk-Yong Choi, Yuri Kivshar. 2018-11-29. Third-harmonic generation in photonic topological metasurfaces. https://doi.org/10.1103/physrevlett.123.103901

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