Hyperspectral Imager with Folded Metasurface Optics,ACS Photonics

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Hyperspectral Imager with Folded Metasurface Optics
ACS Photonics ( IF 6.5 ) Pub Date : 2019-07-30 00:00:00 , DOI: 10.1021/acsphotonics.9b00744
MohammadSadegh Faraji-Dana _{1,

2} , Ehsan Arbabi _{1,

2} , Hyounghan Kwon _{1,

2} , Seyedeh Mahsa Kamali _{1,

2} , Amir Arbabi ₃ , John G. Bartholomew ₁ , Andrei Faraon _{1,

2}

Affiliation

Hyperspectral imaging is a key characterization technique used in various areas of science and technology. Almost all implementations of hyperspectral imagers rely on bulky optics including spectral filters and moving or tunable elements. Here, we propose and demonstrate a line-scanning folded metasurface hyperspectral imager (HSI) that is fabricated in a single lithographic step on a 1 mm thick glass substrate. The HSI is composed of four metasurfaces, three reflective and one transmissive, that are designed to collectively disperse and focus light of different wavelengths and incident angles on a focal plane parallel to the glass substrate. With a total volume of 8.5 mm³, the HSI has spectral and angular resolutions of ∼1.5 nm and 0.075°, over the 750–850 nm and −15° to +15° degree ranges, respectively. Being compact, light weight, and easy to fabricate and integrate with image sensors and electronics, the metasurface HSI opens up new opportunities for utilizing hyperspectral imaging where strict volume and weight constraints exist. In addition, the demonstrated HSI exemplifies the utilization of metasurfaces as high-performance diffractive optical elements for implementation of advanced optical systems.

中文翻译：

折叠式亚表面光学元件的高光谱成像仪

高光谱成像是在科学和技术的各个领域中使用的关键表征技术。几乎所有高光谱成像仪的实现都依赖于庞大的光学器件，包括光谱滤光片以及可移动或可调的元件。在这里，我们提出并演示了一种线扫描折叠式超表面高光谱成像仪（HSI），该扫描仪是在1毫米厚的玻璃基板上的单次光刻步骤中制造的。HSI由四个超表面，三个反射表面和一个透射表面组成，这些表面设计为将不同波长和入射角的光集中分散并聚焦在与玻璃基板平行的焦平面上。总体积为8.5毫米³，HSI在750–850 nm和-15°至+ 15°度范围内分别具有约1.5 nm和0.075°的光谱和角分辨率。超表面HSI体积小，重量轻，易于制造并与图像传感器和电子设备集成在一起，因此在存在严格的体积和重量限制的情况下，为利用高光谱成像提供了新的机遇。此外，已证明的HSI例举了超表面作为高性能衍射光学元件的利用，以实现先进的光学系统。

更新日期：2019-07-30

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