超表面叠层结构中相位相干的等离子体吸收调平
Plasma absorption levelling by phase coherence in meta-surface stacked structure
摘要：
本文提出了一种MIM（metal-metasurface-insulator-metal）叠层结构，以实现中远红外波段的理想吸收。大量的金属复合金属单元放置在绝缘体Ge的均匀层上，绝缘体Ge沉积在均匀的金属Ti表面上。每个单元由四个直角三角形立方体组成，位于正方形的四个边的中间。三个共振吸收峰可以是离散的或平坦的，取决于立方体的厚度。一旦金属立方体比其趋肤深度更薄，就可以实现有效的超宽带吸收体，其平均吸收率超过90%，范围从8-14μm。我们建立了一个四能级腔-偶极相互作用模型来解释等离子体吸收平衡现象。这是由来自元表面的强相位相干性产生的，因为三个混合模式由顶部和下方金属层之间的微腔阵列中的公共腔光子耦合。该结构对红外线具有偏振选择性。它在红外探测和成像方面具有很大的潜力。
英文摘要：
In this paper, we propose a MIM (metallic metasurface-insulator-metal) stacked structure to realize perfect absorption in mid- and far- infrared bandwidth. A large number of metallic composite metallic units placed on a uniform layer of insulator Ge which is deposited on a uniform metallic Ti surface. Each of units consists of four right-angled triangular cubes in middle of four sides of a square. Three resonant absorption peaks can be discrete or levelling dependent to thickness of cubes. Once metallic cubes are thinner than its skin depth, an effective ultra-broadband absorber is realizable with average absorption over 90% percent ranging from 8-14μm. We build a four-level cavity-dipole interacting model to explain phenomena of plasma absorption levelling. This is created by strong phase coherence from meta-surface since three hybrid modes are coupled by common cavity photons in arrays of micro-cavities between top and below metallic layers. The structure is polarization-selective to infrared light. It has great potential in infrared detection and imaging.
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