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Multifunctional resonant wavefront-shaping meta-optics based on multilayer and multi-perturbation nonlocal metasurfaces
Light: Science & Applications ( IF 19.4 ) Pub Date : 2022-08-03 , DOI: 10.1038/s41377-022-00905-6
Stephanie C Malek 1 , Adam C Overvig 1, 2 , Andrea Alù 2, 3 , Nanfang Yu 1
Affiliation  

Photonic devices rarely provide both elaborate spatial control and sharp spectral control over an incoming wavefront. In optical metasurfaces, for example, the localized modes of individual meta-units govern the wavefront shape over a broad bandwidth, while nonlocal lattice modes extended over many unit cells support high quality-factor resonances. Here, we experimentally demonstrate nonlocal dielectric metasurfaces in the near-infrared that offer both spatial and spectral control of light, realizing metalenses focusing light exclusively over a narrowband resonance while leaving off-resonant frequencies unaffected. Our devices attain this functionality by supporting a quasi-bound state in the continuum encoded with a spatially varying geometric phase. We leverage this capability to experimentally realize a versatile platform for multispectral wavefront shaping where a stack of metasurfaces, each supporting multiple independently controlled quasi-bound states in the continuum, molds the optical wavefront distinctively at multiple wavelengths and yet stay transparent over the rest of the spectrum. Such a platform is scalable to the visible for applications in augmented reality and transparent displays.



中文翻译:

基于多层多扰动非局部超表面的多功能共振波前整形元光学

光子设备很少对入射波前提供精细的空间控制和清晰的光谱控制。例如,在光学超表面中,单个超单元的局部模式控制着宽带宽上的波前形状,而扩展到许多晶胞上的非局部晶格模式支持高质量因子共振。在这里,我们通过实验证明了近红外的非局域电介质超表面,它提供了光的空间和光谱控制,实现了超透镜将光完全聚焦在窄带共振上,同时不影响非共振频率。我们的设备通过支持用空间变化的几何相位编码的连续体中的准束缚态来实现此功能。我们利用这种能力通过实验实现多光谱波前整形的多功能平台,其中一堆超表面,每个支持连续体中的多个独立控制的准束缚状态,在多个波长上独特地塑造光波前,但在其余部分保持透明光谱。这样的平台可以扩展到增强现实和透明显示器中的可见应用程序。

更新日期:2022-08-03
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