Bandwidth bounds for wide-field-of-view dispersion-engineered achromatic metalenses

IF 1.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
K. Shastri, F. Monticone
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引用次数: 5

Abstract

Optical systems with wide field-of-views (FOV) are crucial for many applications such as high performance imaging, optical projection, augmented/virtual reality, and miniaturized medical imaging tools. Typically, aberration-free imaging with a wide FOV is achieved by stacking multiple refractive lenses (as in a “fisheye” lens), adding to the size and weight of the optical system. Single metalenses designed to have a wide FOV have the potential to replace these bulky imaging systems and, moreover, they may be dispersion engineered for spectrally broadband operation. In this paper, we derive a fundamental bound on the spectral bandwidth of dispersion-engineered wide-FOV achromatic metalenses. We show that for metalenses with a relatively large numerical aperture (NA), there is a tradeoff between the maximum achievable bandwidth and the FOV; interestingly, however, the bandwidth reduction saturates beyond a certain FOV that depends on the NA of the metalens. These findings may provide important information and insights for the design of future wide-FOV achromatic flat lenses.
宽视场色散工程消色差金属透镜的带宽界限
具有宽视场(FOV)的光学系统对于高性能成像、光学投影、增强/虚拟现实和小型化医学成像工具等许多应用至关重要。通常,宽视场的无像差成像是通过堆叠多个折射透镜(如“鱼眼”透镜)来实现的,增加了光学系统的尺寸和重量。设计成具有宽视场的单超透镜有可能取代这些笨重的成像系统,此外,它们可以用于频谱宽带操作的色散设计。本文推导了色散设计的宽视场消色差超透镜的光谱带宽的基本界。我们表明,对于具有相对较大数值孔径(NA)的超透镜,在最大可实现带宽和视场之间存在权衡;然而,有趣的是,带宽减少超过一定的视场,这取决于超透镜的NA。这些发现可能为未来宽视场消色差平面透镜的设计提供重要的信息和见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
EPJ Applied Metamaterials
EPJ Applied Metamaterials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.10
自引率
6.20%
发文量
16
审稿时长
8 weeks
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