宽带透明惠更斯空间板
Broadband transparent Huygens' spaceplates
AI总结：
本文设计并分析了基于惠更斯条件的空间板，证明其空间压缩能力为传统单共振空间板的两倍，并具有更宽带宽、更高数值孔径和近全透明特性，可用于光学系统小型化。
摘要：
空间板在非局域超表面的背景下应运而生，通过最小化组件之间所需的空余空间来实现光学系统的压缩。在这项工作中，我们设计并分析了支持具有相反对称性共振的空间板，其在所谓的惠更斯条件下工作。利用时间耦合模理论，我们证明了惠更斯空间板提供的空间压缩是传统单共振对应物的两倍。此外，它们可以支持更宽的工作带宽和数值孔径，有助于减少色差。而且，惠更斯空间板在宽频率和角度范围内保持几乎完全透明，允许其直接级联以实现多频率宽带操作。最后，我们提出了一种基于光子晶体平板几何结构的光学频率惠更斯空间板的物理实现。
英文摘要：
Spaceplates have emerged in the context of nonlocal metasurfaces, enabling the compression of optical systems by minimizing the required empty space between their components. In this work, we design and analyze spaceplates that support resonances with opposite symmetries, operating under the so-called Huygens' condition. Using the temporal coupled-mode theory, we demonstrate that the spatial compression provided by Huygens' spaceplates is twice that of conventional single-resonance counterparts. Additionally, they can support broader operational bandwidths and numerical apertures, facilitating the reduction of chromatic aberrations. Moreover, Huygens' spaceplates maintain nearly full transparency over a wide frequency and angular range, allowing their straightforward cascading for multi-frequency broadband operation. Finally, we propose a physical implementation of a Huygens' spaceplate for optical frequencies based on a photonic crystal slab geometry.
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