Abstract Splitting the spectrum of incident light at nanoscale has been of great scientific and practical interest due to its potential application in various optical sensors. For many years, researchers have been striving to realize the full-color sorting of light at subwavelength scale, while keeping the loss of incident photons to a minimum. In this article, we present semiconductor-based metasurfaces that facilitate the efficient sorting of full-color by inducing anti-Hermitian coupling between multiple nanoantenna arrays. To achieve this, we first explore how the coherent interactions between maximally crafted nanoantennas in the metasurfaces can be effectively controlled by judiciously positioning them in both lateral and vertical directions, which leads to the switched coupling of light at each target position. Based on the analysis, we demonstrate a metasurface-based absorber that features efficient, spectropolarimetric detections over the entire visible spectrum, ranging from 470 to 630 nm. In addition, the metasurface detects relatively narrow spectral linewidth of 60 nm and shows the sensitivity up to 70%, which surpasses the previous works on subwavelength photon sorting or color filter-based detection system. We envision that our approach provides guidelines for realizing the metasurfaces with enhanced functionalities, that is the increase of spectral channels for detection in a given subwavelength-scaled unit cell.

中文翻译：

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基于反厄米特表面的全色亚波长分选

摘要 由于其在各种光学传感器中的潜在应用，在纳米尺度上对入射光的光谱进行分裂具有重要的科学和实际意义。多年来，研究人员一直在努力实现亚波长范围内光的全色分选，同时将入射光子的损失保持在最低限度。在本文中，我们提出了基于半导体的超表面，通过在多个纳米天线阵列之间诱导反厄米耦合，促进全色的有效分类。为了实现这一点，我们首先探索如何通过在横向和垂直方向上明智地定位它们来有效控制超表面中最大程度制作的纳米天线之间的相干相互作用，这导致每个目标位置的光的切换耦合。根据分析，我们展示了一种基于超表面的吸收剂，它在整个可见光谱范围内（470 到 630 nm）具有高效的分光偏振检测。此外，超表面检测到 60 nm 的相对较窄的光谱线宽并显示出高达 70% 的灵敏度，这超过了以前在亚波长光子分选或基于滤色器的检测系统方面的工作。我们设想我们的方法为实现具有增强功能的超表面提供指导，即在给定的亚波长缩放单位单元中增加用于检测的光谱通道。超表面检测到 60 nm 的相对较窄的光谱线宽，并显示出高达 70% 的灵敏度，这超过了以前在亚波长光子分选或基于滤色器的检测系统方面的工作。我们设想我们的方法为实现具有增强功能的超表面提供指导，即在给定的亚波长缩放单位单元中增加用于检测的光谱通道。超表面检测到 60 nm 的相对较窄的光谱线宽，并显示出高达 70% 的灵敏度，这超过了以前在亚波长光子分选或基于滤色器的检测系统方面的工作。我们设想我们的方法为实现具有增强功能的超表面提供指导，即在给定的亚波长缩放单位单元中增加用于检测的光谱通道。