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11 June 2024 Second harmonic generation in monolithic gallium phosphide metasurfaces
Muyi Yang, Maximilian A. Weissflog, Zlata Fedorova, Angela Barreda, Stefan Börner, Falk Eilenberger, Thomas Pertsch, Isabelle Staude
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Proceedings Volume PC12990, Metamaterials XIV; PC129901D (2024) https://doi.org/10.1117/12.3022335
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Gallium phosphide (GaP) offers unique opportunities for nonlinear and quantum nanophotonics due to its wide optical transparency range, high second-order nonlinear susceptibility, and the possibility to tailor the nonlinear response by a suitable choice of crystal orientation. However, the availability of single crystalline thin films of GaP on low index substrates, as typically required for nonlinear dielectric metasurfaces, is limited . Here we design resonant monolithic GaP metasurfaces optimized for efficient second harmonic (SH) generation. We experimentally realized the metasurfaces from bulk (110) GaP wafers using electron-beam lithography and an optimized inductively coupled plasma etching process. SH generation measurements show good agreement with numerical simulations and a high NIR-to-visible conversion efficiency reaching up to 10^(-5) for SH emission along the optical axis. Furthermore, we investigated the potential of the suggested monolithic GaP metasurface for SH wavefront shaping applications.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Muyi Yang, Maximilian A. Weissflog, Zlata Fedorova, Angela Barreda, Stefan Börner, Falk Eilenberger, Thomas Pertsch, and Isabelle Staude "Second harmonic generation in monolithic gallium phosphide metasurfaces", Proc. SPIE PC12990, Metamaterials XIV, PC129901D (11 June 2024); https://doi.org/10.1117/12.3022335
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KEYWORDS
Gallium
Second harmonic generation
Crystals
Nonlinear crystals
Quantum optics experiments
Semiconducting wafers
Thin films
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