Terahertz Pseudo-Waveform-Selective Metasurface Absorber Based on a Square-Patch Structure Loaded with Linear Circuit Components

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Photonics Research Pub Date : 2024-06-27 DOI:10.1002/adpr.202300303
Yongzhi Cheng, Rui Xing, Fu Chen, Hui Luo, Ashif Aminulloh Fathnan, Hiroki Wakatsuchi
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Abstract

In recent years, metasurfaces composed of lumped nonlinear circuits have been reported to exhibit the capability of detecting specific electromagnetic waves, even when the waves are of the same frequency, depending on their respective waveforms or, more precisely, their pulse widths. Herein, three types of metasurface absorbers (MSAs) are presented which are composed of a square-patch structure loaded with linear circuit components, including lumped resistors or resistors in parallel with capacitors/inductors, which can mimic the waveform-selective absorption behavior in the terahertz (THz) region. By judiciously selecting suitable values for the linear circuit components, these MSAs can achieve near-perfect absorption of incident continuous waves or longer pulses while exhibiting reduced absorption of short pulses at the same THz frequency. These linear circuit structures can be referred to as pseudo-waveform-selective MSAs because their waveform-selective absorption characteristics are primarily derived from the dispersion behavior of the resonator structures, as opposed to the frequency conversion commonly observed in nonlinear circuits. These outcomes and discoveries introduce an additional degree of freedom for waveform discrimination in the THz frequency range, potentially enabling a broader range of applications, including but not limited to detection, sensing, and wireless communication.

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基于加载线性电路元件的方形贴片结构的太赫兹伪波形选择性元表面吸收器
近年来,有报道称由叠加非线性电路组成的元表面具有探测特定电磁波的能力,即使这些电磁波的频率相同,这取决于它们各自的波形,或者更准确地说,取决于它们的脉冲宽度。本文介绍了三种类型的元表面吸收器(MSA),它们由加载线性电路元件的方形贴片结构组成,包括叠加电阻器或与电容器/电感器并联的电阻器,可模仿太赫兹(THz)区域的波形选择性吸收行为。通过明智地为线性电路元件选择合适的值,这些 MSA 可以实现对入射连续波或较长的脉冲近乎完美的吸收,同时在相同的太赫兹频率下表现出对短脉冲的吸收减弱。这些线性电路结构可称为伪波形选择 MSA,因为它们的波形选择吸收特性主要来自谐振器结构的色散行为,而非非线性电路中常见的频率转换。这些成果和发现为太赫兹频率范围内的波形分辨带来了额外的自由度,有可能实现更广泛的应用,包括但不限于探测、传感和无线通信。
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