Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces Hähnel, David Förstner, Jens Myroshnychenko, Viktor tet_topic_meta ddc:530 Dielectric metasurfaces provide a unique platform for efficient harmonic generation and optical wavefront manipulation at the nanoscale. Tailoring phase and amplitude of a nonlinearly generated wave with a high emission efficiency using resonance-based metasurfaces is a challenging task that often requires state-of-the-art numerical methods. Here, we propose a simple yet effective approach combining a sampling method with a Monte Carlo approach to design the third-harmonic wavefront generated by all-dielectric metasurfaces composed of elliptical silicon nanodisks. Using this approach, we theoretically demonstrate the full nonlinear 2π phase control with a uniform and highest possible amplitude in the considered parameter space, allowing us to design metasurfaces operating as third harmonic beam deflectors capable of steering light into a desired direction with high emission efficiency. The TH beam deflection with a record calculated average conversion efficiency of 1.2 × 10–1 W–2 is achieved. We anticipate that the proposed approach will be widely applied as alternative to commonly used optimization algorithms with higher complexity and implementation effort for the design of metasurfaces with other holographic functionalities. American Chemical Society (ACS) 2023 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_6501 https://ris.uni-paderborn.de/record/45596 https://ris.uni-paderborn.de/download/45596/45597 Hähnel D, Förstner J, Myroshnychenko V. Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. <i>ACS Photonics</i>. Published online 2023. doi:<a href="https://doi.org/10.1021/acsphotonics.2c01967">10.1021/acsphotonics.2c01967</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1021/acsphotonics.2c01967 info:eu-repo/semantics/altIdentifier/issn/2330-4022 info:eu-repo/semantics/altIdentifier/issn/2330-4022 info:eu-repo/grantAgreement/EC/231447078 info:eu-repo/grantAgreement/EC/231447078 info:eu-repo/grantAgreement/EC/231447078 info:eu-repo/semantics/openAccess