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 pri...

中文翻译：

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反埃尔米特耦合堆叠石墨烯超表面的宽带近统一光吸收

单层或多层石墨烯与光之间相互作用的增强对于基于石墨烯的光电器件的潜在应用至关重要。近来，已经提出了各种纳米结构的石墨烯以实现有效的光吸收，而增强的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的基于石墨烯的超颖表面以实现宽带统一吸收的有效方法。该设计的主要概念是基于反赫耳米特耦合原理，实现石墨烯谐振器之间的接近零互耦。由于相邻石墨烯谐振器之间直接近场耦合的影响，这种耦合将抑制模式分裂，并因此通过单个谐振的叠加来实现宽带吸收。在...