We present the first experimental demonstration of a tunable reflectionless absorption resonance in a metamaterial integrated with a plasma discharge. A one-dimensional metamaterial structure excites transverse magnetic slow-wave modes known as ‘spoof’ surface plasmon polaritons. When interfaced with an argon plasma discharge, the metamaterial-induced ‘spoof’ plasmon mode is converted to a plasmon polariton mode confined to the plasma/dielectric interface. The reflectionless absorption band that manifests in the metamaterial’s spectral response exhibits a dependency on the plasma’s electron density that agrees well with theory.

中文翻译：

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等离子-超材料复合结构中电磁波的可调无反射吸收

我们目前在与等离子体放电集成的超材料中可调谐无反射吸收共振的第一个实验演示。一维超材料结构激发被称为“欺骗”表面等离子体激元极化子的横向磁慢波模式。当与氩等离子体放电接触时，超材料诱导的“欺骗”等离子体激元模式转换为局限于等离子体/介电界面的等离子体激元极化子模式。超材料的光谱响应中出现的无反射吸收带表现出对等离子体电子密度的依赖性，这与理论非常吻合。