Due to several advantages over conventional devices for the control of electromagnetic (EM) radiation, the demand for metasurface utilization based on artificially engineered micro and nanostructures is boosted, especially in new generation devices. Among the metasurfaces family, there has been a growing interest in Huygens’ metasurfaces that are easy to fabricate due to their lower aspect ratio compared to their counterparts and also provide alternative electromagnetic radiation control by tuning the dipolar electric and magnetic resonances. In this study, an all-dielectric Huygens’ metasurface consisting of the high-refractive-index nano shells embedded in the low-refractive-index environment is designed and extensively investigated numerically and analytically in the near-infrared spectrum. By simply tuning the nano shell inner radius, the effects on the dipolar resonances are unveiled specific to the proposed design. To assess the EM wave interactions in the designed Huygens’ metasurface, an analytical model based on the coupled discrete dipole approach is applied for selected distinct cases of the designed metasurface. It is shown that the spectral position of the dipolar resonances can be detuned or tuned simultaneously depending on the structural parameter of the meta-atoms arranged in a periodic array. This study sheds light on the physics and abilities of the nano shell structure as a Huygens’ metasurface for the potential applications of metasurface-based light–matter interaction including imaging and sensing.

中文翻译：

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纳米壳对惠更斯超表面偶极共振和光学响应的​​影响

由于在电磁 (EM) 辐射控制方面优于传统设备的几个优势，对基于人工设计的微纳米结构的超表面利用的需求得到了提升，尤其是在新一代设备中。在超表面家族中，人们对惠更斯超表面的兴趣越来越大，由于与同类产品相比，它们的纵横比较低，因此易于制造，并且还可以通过调整偶极电和磁共振来提供替代的电磁辐射控制。在这项研究中，设计了一个由嵌入低折射率环境中的高折射率纳米壳组成的全介电惠更斯超表面，并在近红外光谱中进行了广泛的数值和分析研究。通过简单地调整纳米壳内半径，对偶极共振的影响是针对拟议设计的。为了评估设计的惠更斯超表面中的 EM 波相互作用，基于耦合离散偶极子方法的分析模型应用于设计的超表面的选定不同情况。结果表明，根据以周期性阵列排列的元原子的结构参数，偶极共振的光谱位置可以同时失谐或调谐。这项研究揭示了纳米壳结构作为惠更斯超表面的物理特性和能力，用于基于超表面的光-物质相互作用的潜在应用，包括成像和传感。基于耦合离散偶极子方法的分析模型应用于设计的超表面的选定不同情况。结果表明，根据以周期性阵列排列的元原子的结构参数，偶极共振的光谱位置可以同时失谐或调谐。这项研究揭示了纳米壳结构作为惠更斯超表面的物理特性和能力，用于基于超表面的光-物质相互作用的潜在应用，包括成像和传感。基于耦合离散偶极子方法的分析模型应用于设计的超表面的选定不同情况。结果表明，根据以周期性阵列排列的元原子的结构参数，偶极共振的光谱位置可以同时失谐或调谐。这项研究揭示了纳米壳结构作为惠更斯超表面的物理特性和能力，用于基于超表面的光-物质相互作用的潜在应用，包括成像和传感。