论文标题
伪波形选择性元信息及其性能有限
Pseudo-Waveform-Selective Metasurfaces and Their Limited Performance
论文作者
论文摘要
近年来，据报道，包括非线性肖特基二极管在内的集总电路组件组成的元信息也能够在相同的频率下，具体取决于其波形，或更具体地说是其脉冲宽度。在这项研究中，我们仅使用线性电路和线性介质报告了类似波形选择性现象。尽管在分析和数值上证明了这种线性跨面积以表现出可变的吸收性能，但不能严格将其归类为波形选择吸收。这是由于以下事实：线性跨度中的波形选择性响应起源于结构的分散行为，而不是在非线性波形选择性元信息中看到的频率转化。因此，我们将这些线性结构称为伪波形选择性的元信息。此外，我们表明，除非引入非线性，否则伪波形选择性的元信息的性能有限。这些结果和发现证实了非线性波形选择性元面的优势，可以利用这些元素来提供额外的自由度来解决现有的电磁问题/挑战，即涉及相同频率的波浪。
In recent years, metasurfaces composed of lumped circuit components, including nonlinear Schottky diodes, have been reported to be capable of sensing particular electromagnetic waves even at the same frequency depending on their waveforms, or more specifically, their pulse widths. In this study, we report analogous waveform-selective phenomena using only linear circuits and linear media. Although such linear metasurfaces are analytically and numerically demonstrated to exhibit variable absorption performance, it cannot strictly be categorized as waveform-selective absorption. It is due to the fact that the waveform-selective responses in the linear metasurfaces are originated from the dispersion behaviors of the structures rather than the frequency-conversion seen in nonlinear waveform-selective metasurfaces. We thus refer to these linear structures as pseudo-waveform-selective metasurfaces. Additionally, we show that the pseudo-waveform-selective metasurfaces have limited performance unless nonlinearity is introduced. These results and findings confirm the advantages of nonlinear waveform-selective metasurfaces, which can be exploited to provide an additional degree of freedom to address existing electromagnetic problems/challenges involving even waves at the same frequency.
