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Modeling Metasurfaces Using Discrete-Space Impulse Response Technique
ACS Photonics ( IF 7 ) Pub Date : 2020-03-11 , DOI: 10.1021/acsphotonics.9b01458
Mahsa Torfeh 1 , Amir Arbabi 1
Affiliation  

Metasurfaces are arrays of subwavelength meta-atoms that shape waves in a compact and planar form factor. Analysis and design of metasurfaces require methods for modeling their interactions with waves. Conventional modeling techniques assume that metasurfaces are locally periodic structures excited by plane waves, restricting their applicability to gradually varying metasurfaces that are illuminated with plane waves. Here we introduce the discrete-space impulse response concept that enables the development of accurate and general models for metasurfaces. According to the proposed model, discrete impulse responses are assigned to metasurface unit cells and are used to determine the metasurface response to any arbitrary incident waves. We verify the accuracy of the model by comparing its results with full-wave simulations. The proposed concept and modeling technique are applicable to linear metasurfaces with arbitrary meta-atoms, and the resulting system-level models can be used to accurately incorporate metasurfaces into simulation and design tools that use wave or ray optics.

中文翻译:

使用离散空间脉冲响应技术对超表面建模

超表面是亚波长亚原子的阵列,它们以紧凑而平面的形状整形波。超表面的分析和设计需要用于建模其与波相互作用的方法。传统的建模技术假定超表面是平面波激发的局部周期性结构,从而将其适用性限制为逐渐变化的用平面波照射的超表面。在这里,我们介绍了离散空间脉冲响应概念,该概念使得能够为超表面建立准确而通用的模型。根据提出的模型,将离散的脉冲响应分配给超表面单元,并用于确定对任意入射波的超表面响应。我们通过将其结果与全波仿真进行比较来验证模型的准确性。
更新日期:2020-04-23
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