Toward 3D-printed inverse-designed metaoptics Roques-Carmes, Charles Lin, Zin Christiansen, Rasmus E. Salamin, Yannick Kooi, Steven E. Joannopoulos, John D. Johnson, Steven G. Soljačić, Marin metasurfaces inverse design multilayered metaoptics 3D printing topology optimization ddc:530 Optical metasurfaces have been heralded as the platform to integrate multiple functionalities in a compact form-factor, with the potential to replace bulky optical components. A central stepping stone toward realizing this promise is the demonstration of multifunctionality under several constraints (e.g., at multiple incident wavelengths and/or angles) in a single device, an achievement being hampered by design limitations inherent to single-layer planar geometries. Here, we propose a framework for the inverse design of multilayer metaoptics via topology optimization, showing that even few-wavelength thick devices can achieve high-efficiency multifunctionality, such as multiangle light concentration and plan-achromaticity. We embody our framework in multiple closely spaced patterned layers of a low-index polymer, with fabrication constraints specific to this platform enforced in the optimization process. We experimentally demonstrate our approach with an inverse-designed 3D-printed light concentrator working at five different nonparaxial angles of incidence. Our framework paves the way toward realizing multifunctional ultracompact 3D nanophotonic devices. American Chemical Society 2022 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_6501 https://research-explorer.ista.ac.at/record/21527 Roques-Carmes C, Lin Z, Christiansen RE, et al. Toward 3D-printed inverse-designed metaoptics. <i>ACS Photonics</i>. 2022;9(1):43-51. doi:<a href="https://doi.org/10.1021/acsphotonics.1c01442">10.1021/acsphotonics.1c01442</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1021/acsphotonics.1c01442 info:eu-repo/semantics/altIdentifier/e-issn/2330-4022 info:eu-repo/semantics/altIdentifier/arxiv/2105.11326 info:eu-repo/semantics/openAccess