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Focusing on bandwidth: achromatic metalens limits
Optica ( IF 10.4 ) Pub Date : 2020-06-03 , DOI: 10.1364/optica.389404 Federico Presutti , Francesco Monticone
Optica ( IF 10.4 ) Pub Date : 2020-06-03 , DOI: 10.1364/optica.389404 Federico Presutti , Francesco Monticone
Metalenses have shown great promise in their ability to function as ultracompact optical systems for focusing and imaging. Remarkably, several designs have been recently demonstrated that operate over a large range of frequencies with minimized chromatic aberrations, potentially paving the way for ultrathin achromatic optics. Here, we derive fundamental bandwidth limits that apply to broadband optical metalenses regardless of their implementation. Specifically, we discuss how the product between achievable time delay and bandwidth is limited in any time-invariant system, and we apply well-established bounds on this product to a general focusing system. We then show that all metalenses designed thus far obey the appropriate bandwidth limit. The derived physical bounds provide a useful metric to compare and assess the performance of different devices, and they offer fundamental insight into how to design better broadband metalenses.
中文翻译:
关注带宽:消色差金属极限
Metalenses在用作聚焦和成像的超紧凑光学系统方面已经显示出巨大的希望。引人注目的是,最近已经证明了几种设计,它们可以在很大的频率范围内以最小的色差运行,从而有可能为超薄消色差光学器件铺平道路。在这里,我们推导出适用于宽带光学金属传感器的基本带宽限制,无论其实现如何。具体来说,我们讨论了在任何时不变系统中如何限制可达到的时间延迟和带宽之间的乘积,并且我们将此乘积的既定界限应用于一般的聚焦系统。然后,我们表明到目前为止设计的所有元传感器都遵守适当的带宽限制。
更新日期:2020-06-22
中文翻译:
关注带宽:消色差金属极限
Metalenses在用作聚焦和成像的超紧凑光学系统方面已经显示出巨大的希望。引人注目的是,最近已经证明了几种设计,它们可以在很大的频率范围内以最小的色差运行,从而有可能为超薄消色差光学器件铺平道路。在这里,我们推导出适用于宽带光学金属传感器的基本带宽限制,无论其实现如何。具体来说,我们讨论了在任何时不变系统中如何限制可达到的时间延迟和带宽之间的乘积,并且我们将此乘积的既定界限应用于一般的聚焦系统。然后,我们表明到目前为止设计的所有元传感器都遵守适当的带宽限制。