Inverse designed extended depth of focus meta-optics for broadband imaging in the visible
Inverse designed extended depth of focus meta-optics for broadband imaging in the visible
复制标题
DOI：
10.1515/nanoph-2021-0431
复制
发表时间：
2021-09-24
期刊：
影响因子：
7.5
通讯作者：
Majumdar, Arka
中科院分区：
文献类型：
--
作者：
Bayati, Elyas;Pestourie, Raphael;Majumdar, Arka
我们报道了一种反向设计的、大数值孔径(类似于0.44)、扩展焦深(EDOF)的亚光学元件，它呈现出类似透镜的点扩展函数(PSF)。EDOF偏光镜在整个焦深范围内保持了与双曲面金属透镜相当的聚焦效率。利用扩展的焦深和计算后处理，我们使用1 mm、f/1的偏光镜演示了全可见光谱的宽带成像。与其他标准的EDOF亚光学器件不同，我们的设计以对数非球面或三次函数等位相掩模为特征，在类似于290 nm的光学带宽上显示出高度不变的PSF，这导致了图像质量的显著改善，通过结构相似性度量来量化。
We report an inverse-designed, high numerical aperture (similar to 0.44), extended depth of focus (EDOF) meta-optic, which exhibits a lens-like point spread function (PSF). The EDOF meta-optic maintains a focusing efficiency comparable to that of a hyperboloid metalens throughout its depth of focus. Exploiting the extended depth of focus and computational post processing, we demonstrate broadband imaging across the full visible spectrum using a 1 mm, f/1 meta-optic. Unlike other canonical EDOF meta-optics, characterized by phase masks such as a log-asphere or cubic function, our design exhibits a highly invariant PSF across similar to 290 nm optical bandwidth, which leads to significantly improved image quality, as quantified by structural similarity metrics.