三维图案化逆向设计中红外超光学器件
3D-Patterned Inverse-Designed Mid-Infrared Metaoptics
AI总结：
本文利用双光子光刻实现三维多层纳米散射结构，通过逆向设计制造中红外多光谱与偏振分选器件，并仿真展示基于角动量的光重定向，证明三维纳米图案化可直接改造传感器阵列散射特性以构建先进成像系统。
摘要：
现代成像系统可以通过引入多层纳米图案化结构，基于光的基本特性来操控光，从而在效率、紧凑性和应用方面得到增强。由于普遍使用的滤光片阵列会丢弃大部分入射光，高透射效率的多光谱成像至今仍出人意料地难以实现。此外，大多数相机并未充分利用偏振和空间自由度中蕴含的丰富信息。光学超材料能够响应这些电磁特性，但此前主要是在单层几何结构中被探索，这限制了其性能和多功能能力。在此，我们利用先进的双光子光刻技术实现多层散射结构，这些结构能够实现高度非平凡的光学变换，旨在光到达焦平面阵列之前对其进行处理。计算优化的多光谱和偏振分选器件以亚微米特征尺寸制造，并在中红外波段进行了实验验证。仿真中展示的最终结构能够根据光的角动量对光进行重新定向。这些器件表明，通过精确的三维纳米图案化，可以直接修改传感器阵列的散射特性，从而构建先进的成像系统。
英文摘要：
Modern imaging systems can be enhanced in efficiency, compactness, and application through introduction of multilayer nanopatterned structures for manipulation of light based on its fundamental properties. High transmission efficiency multispectral imaging is surprisingly elusive due to the commonplace use of filter arrays which discard most of the incident light. Further, most cameras do not leverage the wealth of information in polarization and spatial degrees of freedom. Optical metamaterials can respond to these electromagnetic properties but have been explored primarily in single-layer geometries, limiting their performance and multifunctional capacity. Here we use advanced two-photon lithography to realize multilayer scattering structures that achieve highly nontrivial optical transformations intended to process light just before it reaches a focal plane array. Computationally optimized multispectral and polarimetric sorting devices are fabricated with submicron feature sizes and experimentally validated in the mid-infrared. A final structure shown in simulation redirects light based on its angular momentum. These devices demonstrate that with precise 3-dimensional nanopatterning, one can directly modify the scattering properties of a sensor array to create advanced imaging systems.
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