
1.Theoretical Electrical Engineering & CeOPP, Paderborn University, 33098, Paderborn, Germany
2.Physics Department & CeOPP, Paderborn University, 33098, Paderborn, Germany
David Hähnel (hdavid@mail.upb.de)
Christian Golla (christian.golla@upb.de)
Published:31 May 2023,
Published Online:21 April 2023,
Received:26 October 2022,
Revised:8 March 2023,
Accepted:14 March 2023
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Hähnel, D. et al. A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. Light: Science & Applications, 12, 847-854 (2023).
Hähnel, D. et al. A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. Light: Science & Applications, 12, 847-854 (2023). DOI: 10.1038/s41377-023-01134-1.
We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These 'Super-Fano' resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover
quantitative nonlinear measurements are performed
in which an absolute conversion efficiency as high as
η
max
≈ 2.8 × 10
−7
a peak power intensity of 1.2 GW cm
−2
is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications.
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