基于离散空间脉冲响应技术的元表面建模
Modeling metasurfaces using discrete-space impulse response technique
摘要：
超表面是亚波长超原子的阵列，其以紧凑且平面的形状因子对波进行整形。元表面的分析和设计需要对它们与波的相互作用进行建模的方法。传统的建模技术假设超颖表面是由平面波激发的局部周期性结构，限制了它们对用平面波照射的逐渐变化的超颖表面的适用性。在这里，我们介绍了离散空间脉冲响应的概念，使准确和通用模型的元表面的发展。根据所提出的模型，离散脉冲响应被分配到元表面单元格，并用于确定元表面对任意入射波的响应。我们验证了模型的准确性，通过比较其结果与全波模拟。所提出的概念和建模技术适用于具有任意元原子的线性元表面，并且所得到的系统级模型可以用于将元表面准确地结合到使用波或射线光学的仿真和设计工具中。
英文摘要：
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.
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