Scalable nanoimprint manufacturing of multi-layer hybrid metasurface device

Optical metasurfaces, consisting of subwavelength-scale meta-atom arrays, hold great promise to overcome fundamental limitations of conventional optics. Scalable nanomanufacturing of metasurfaces with high uniformity and reproducibility is key to transferring technology from laboratory demonstrations to commercialization. Recently, nanoimprint lithography (NIL) has attracted increasing interests for metasurface fabrication because of its superior nanometer resolution, rapid prototyping and large-area manufacturing capability. Despite NIL demonstrations of single-layer metasurface, scalable fabrication of double- and multi-layer metasurfaces remains challenging. Here we leverage the nanometer-scale resolution and 3D pattern transfer capability of NIL to fabricate multi-layered metasurfaces for on-chip polarimetric imaging devices. Our process achieved sub-100 nm nanostructures, high alignment accuracy (translational error