Method for extracting the equivalent admittance from time-varying metasurfaces and its application to self-tuned spatiotemporal wave manipulation
Method for extracting the equivalent admittance from time-varying metasurfaces and its application to self-tuned spatiotemporal wave manipulation
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DOI：
10.1088/1361-6463/ac9b67
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发表时间：
2023-01-05
影响因子：
3.4
通讯作者：
Wakatsuchi, Hiroki
中科院分区：
文献类型：
--
作者：
Fathnan, Ashif Aminulloh;Homma, Haruki;Wakatsuchi, Hiroki
由于其自调谐时变响应，嵌入非线性电子器件的波形选择超表面显示出迷人的应用，包括根据脉冲宽度（PW）区分不同的电磁波。然而，到目前为止，它们只是在空间均匀散射剖面上实现的。通过将超表面建模为时变导纳片，我们提供了一种分析计算方法来预测超表面的时域响应。这允许以等效片导纳的形式推导设计规范，这对于合成具有时空控制的超表面是有用的，例如实现具有规定时间相关衍射特性的超表面。作为一个例子，基于所提出的等效导纳片模型，我们合成了一个随入射功率变化的可选择波长的菲涅耳带片。本文提出的pw相关元表面的合成方法可以扩展到设计具有更复杂时空波操作的元表面，有利于传感、无线通信和信号处理等应用。
With their self-tuned time-varying responses, waveform-selective metasurfaces embedded with nonlinear electronics have shown fascinating applications, including distinguishing different electromagnetic waves depending on the pulse width (PW). However, thus far they have only been realized with a spatially homogeneous scattering profile. Here, by modeling a metasurface as time-varying admittance sheets, we provide an analytical calculation method to predict the metasurface time-domain responses. This allows derivation of design specifications in the form of equivalent sheet admittance, which is useful in synthesizing a metasurface with spatiotemporal control, such as to realize a metasurface with prescribed time-dependent diffraction characteristics. As an example, based on the proposed equivalent admittance sheet modeling, we synthesize a waveform-selective Fresnel zone plate with variable focal length depending on the incoming PW. The proposed synthesis method for PW-dependent metasurfaces may be extended to designing metasurfaces with more complex spatiotemporal wave manipulation, benefiting applications such as sensing, wireless communications and signal processing.