Multilayer 3D printed structures for high-numerical aperture achromatic lenses

https://phys.org/news/2023-12-3d-multilayer-high-numerical-aperture-achromatic.html

"Nanoscale GmbH photonic professional 3D printing with galvo-scanned focused beam inducing crosslinking of liquid resin into nanoscale solid voxel... spacing distance 3X focal length to objectives... high focusing efficiency with broadband performance and topological optimization. removes chromatic aberrations, regards each layer as achromatic corrector and focusing element... low refractive stacked metasurfaces extends performance into broadband functions while preserving high numerical aperture"