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Enhanced high-harmonic generation from an all-dielectric metasurface

Abstract

The recent observation of high-harmonic generation from solids creates a new possibility for engineering fundamental strong-field processes by patterning the solid target with subwavelength nanostructures. All-dielectric metasurfaces exhibit high damage thresholds and strong enhancement of the driving field, making them attractive platforms to control high harmonics and other high-field processes at the nanoscale. Here we report enhanced non-perturbative high-harmonic emission from a Fano-resonant Si metasurface that possesses a classical analogue of electromagnetically induced transparency. The harmonic emission is enhanced by more than two orders of magnitude compared to unpatterned samples. The enhanced high harmonics are highly anisotropic with respect to the excitation polarization and are selective by the excitation wavelength due to its resonant features. By combining nanofabrication technology and ultrafast strong-field physics, our work paves the way for the design of new compact ultrafast photonic devices that operate under high intensities and at short wavelengths.

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Fig. 1: Working principle of the metasurface and resonance characterization.
Fig. 2: High-harmonic spectra from a Si metasurface.
Fig. 3: Dependence of non-perturbative high-harmonic yield on excitation intensity.
Fig. 4: Dependence of the high-harmonic spectra on the excitation wavelength.

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Acknowledgements

This project was supported primarily by the Air Force Office of Scientific Research under grant no. FA9550-14-1-0108. We thank S.Ghimire and J.Lu for technical support.

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Contributions

H.L. and C.G. contributed equally to this work. H.L. conceived the experiment. C.G. and M.X. performed FDTD simulations. H.L. and J.L.Z. fabricated the device. H.L. and G.V. performed the HHG measurement under the supervision of D.A.R. H.L., C.G, T.S., and J.L.Z. characterized the resonance. All authors contributed to the discussion and preparation of the manuscript.

Corresponding authors

Correspondence to Hanzhe Liu or David A. Reis.

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The authors declare no competing interests.

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Liu, H., Guo, C., Vampa, G. et al. Enhanced high-harmonic generation from an all-dielectric metasurface. Nature Phys 14, 1006–1010 (2018). https://doi.org/10.1038/s41567-018-0233-6

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