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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Broadband near-unity light absorption with anti-hermitian coupled stacked graphene metasurfaces
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Broadband near-unity light absorption with anti-hermitian coupled stacked graphene metasurfaces

机译：宽带近乎统一光吸收抗隐密度耦合堆叠石墨烯元锉

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摘要

Enhancement of the interaction between monolayer or few-layers graphene and light is crucial to the potential applications of graphene-based optoelectronic devices. Recently, various nanostructured graphene has been proposed to achieve efficient optical absorption, whereas the bandwidth of the enhanced spectral absorption is always fairly narrow, which might be disadvantageous to their opt-electrical applications relying on light harvesting. In this work, we propose an effective method of constructing a stacked graphene-based metasurface to achieve broadband unity absorption. The main concept of the design is to realize the near-zero mutual coupling among graphene resonators based on the idea of anti-Hermitian coupling. This coupling will restrain the mode splitting due to the effect of direct near-field coupling between the neighboring graphene resonators, and thus facilitate the realization of a broadband absorption through the superposition of the individual resonance. In principle, the absorption bandwidth could be expanded further, and the proposed idea might also be used to design broadband absorber of other sub-wavelength nano-resonators.
机译：增强单层或几层石墨烯与光的相互作用对石墨烯基光电子器件的潜在应用至关重要。最近，人们提出了各种纳米结构石墨烯来实现有效的光吸收，然而增强光谱吸收的带宽总是相当窄，这可能不利于它们依赖于光收集的光电应用。在这项工作中，我们提出了一种构建堆叠石墨烯基超表面以实现宽带单位吸收的有效方法。该设计的主要思想是基于反厄米耦合的思想实现石墨烯谐振器之间的近零互耦。这种耦合将抑制由于相邻石墨烯谐振器之间的直接近场耦合效应而产生的模式分裂，从而促进通过单个共振的叠加实现宽带吸收。从原理上讲，吸收带宽可以进一步扩展，所提出的想法也可以用于设计其他亚波长纳米谐振器的宽带吸收器。

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