The rapid advancement of terahertz(THz) technology has sparked significant interest in exploring tunable broadband functional devices. In this study, we propose an antisymmetric graphene skeletonized structure to achieve a terahertz double-broadband perfect absorber. This absorber consists of a gold (Au) substrate, a TOPAS dielectric layer and C4 regular antisymmetric-patterned graphene embedded in the polymer. It exhibits two unpolarized perfect absorbing broadbands through the resonance mechanisms of localized surface-isolated exciton resonance and electromagnetic dipole resonance. The results indicate high absorbance exceeding 90% across two distinct frequency ranges of 0.93–2.03 THz and 4.16–5.3 THz. The dual-broadband absorption feature stems from the pronounced aggregation effect of the “Hollow-out corner” on the electric field, enabling modulation of the second Harmonic while leaving the first Harmonic largely unaffected. The absorber’s response can be dynamically tuned through adjusting the Fermi energy level and structural parameters of graphene. Our design opens up possibilities for diverse applications in photodetectors, THz modulation, and stealth technologies.

中文翻译：

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石墨烯基太赫兹可调谐双宽带完美吸收体

太赫兹（THz）技术的快速发展引发了人们对探索可调谐宽带功能器件的浓厚兴趣。在这项研究中，我们提出了一种反对称石墨烯骨架结构来实现太赫兹双宽带完美吸收器。该吸收器由金 (Au) 基板、TOPAS 介电层和嵌入聚合物中的 C4 规则反对称图案石墨烯组成。它通过局域表面隔离激子共振和电磁偶极子共振的共振机制表现出两个非偏振完美吸收宽带。结果表明，在 0.93-2.03 THz 和 4.16-5.3 THz 两个不同频率范围内，吸光度超过 90%。双宽带吸收特性源于“空心角”对电场的明显聚合效应，能够调制二次谐波，同时使一次谐波基本不受影响。通过调整石墨烯的费米能级和结构参数可以动态调整吸收器的响应。我们的设计为光电探测器、太赫兹调制和隐形技术的多种应用开辟了可能性。