Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Second Harmonic Generation From Phase-Engineered Metasurfaces of Nanoprisms

Version 1 : Received: 12 August 2020 / Approved: 13 August 2020 / Online: 13 August 2020 (11:32:52 CEST)

A peer-reviewed article of this Preprint also exists.

Mochizuki, K.; Sugiura, M.; Yogo, H.; Lundgaard, S.; Hu, J.; Ng, S.H.; Nishijima, Y.; Juodkazis, S.; Sugita, A. Second Harmonic Generation from Phase-Engineered Metasurfaces of Nanoprisms. Micromachines 2020, 11, 848. Mochizuki, K.; Sugiura, M.; Yogo, H.; Lundgaard, S.; Hu, J.; Ng, S.H.; Nishijima, Y.; Juodkazis, S.; Sugita, A. Second Harmonic Generation from Phase-Engineered Metasurfaces of Nanoprisms. Micromachines 2020, 11, 848.

Journal reference: Micromachines 2020, 11, 848
DOI: 10.3390/mi11090848

Abstract

Metasurfaces of gold (Au) nanoparticles on a SiO2-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off. Triangular Au nanoprisms which are non-centro-symmetric and support the second- order non-linearity were examined for SHG. The thickness of the SiO2 spacer is shown to be an efficient parameter to spectrally tune to maximise SHG. Electrical field enhancement at the fundamental wavelength was shown to define the intensity of the second harmonics. Numerical modeling of light enhancement was verified by experimental measurements of SHG and reflectivity spectra at the normal incidence. At the plasmonic resonance, SHG is enhanced up to ∼3.5×103 times for the optimised conditions.

Subject Areas

metasurfaces, second harmonic generation, phase control, finite difference time domain

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