论文标题
宽视野色散工程的具有宽场的带宽边界
Bandwidth bounds for wide-field-of-view dispersion-engineered achromatic metalenses
论文作者
论文摘要
具有广泛视野（FOV）的光学系统对于许多应用程序至关重要，例如高性能成像，光影，增强/虚拟现实和微型医学成像工具。通常，通过堆叠多个折射镜头（如“鱼眼”镜头中，可以实现具有宽FOV的像差成像，从而增加了光学系统的尺寸和重量。旨在具有宽FOV的单金属有可能替代这些笨重的成像系统，此外，它们可能是为宽带操作而设计的分散。在本文中，我们得出了一个基本结合的，构成了分散工程宽型金属的光谱带宽。我们表明，对于具有相对较大的数值孔径（NA）的金属，最大可实现的带宽与FOV之间存在权衡。然而，有趣的是，带宽的降低超出了一定的FOV，取决于金属的NA。这些发现可能会为未来的宽型物质扁平镜头设计提供重要的信息和见解。
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.
