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Sum frequency generation is the process in which two incoming photons are converted into an outgoing photon of higher energy. This process is highly inefficient, and therefore requires either large interaction distances in bulky crystals, or large field concentrations in the non-linear materials. Metasurfaces are one such platform to generate extreme field enhancements with resonant processes. In this work, we use topology optimisation to design metasurfaces that exhibit increase high efficiency sum frequency generation, as well as the ability to tailor the generated polarisation.
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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Neuton Li, Jihua Zhang, Dragomir N. Neshev, Andrey A. Sukhorukov, "High-efficiency sum frequency generation from inverse designed metasurfaces," Proc. SPIE 12647, Active Photonic Platforms (APP) 2023, 126470G (4 October 2023); https://doi.org/10.1117/12.2677200