This work presents the design and fabrication of polymeric, structural optical filters that simultaneously focus light. These filters represent a novel, to the best of our knowledge, design at the boundary between diffractive optics and metasurfaces that may provide significant advantages for both digital and hyperspectral imaging. Filters for visible and near-infrared wavelengths were designed using finite-difference time-domain (FDTD) simulations. Prototype filters were fabricated using two-photon lithography, a form of nanoscale 3D printing, and have geometries suitable to replication by molding. The experimentally measured spectral transmission and focused spot size of each filter show excellent agreement with simulation.

中文翻译：

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混合超表面同时聚焦和过滤

这项工作提出了同时聚焦光的聚合物结构滤光片的设计和制造。就我们所知，这些滤光片代表了一种新颖的衍射光学和超表面之间边界的设计，这可能为数字成像和高光谱成像提供重要优势。使用有限差分时域（FDTD）模拟设计了可见光和近红外波长的滤光片。原型滤光片使用双光子光刻技术（一种纳米级3D打印）制造，并且具有适合通过模制复制的几何形状。实验测得的光谱透射率和每个滤光片的聚焦光斑尺寸与仿真显示出极好的一致性。