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Quad-band terahertz absorption enabled using a rectangle-shaped resonator cut with an air gap

机译：使用带气隙的矩形谐振器实现四频太赫兹吸收

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Quad-band terahertz absorption responses were theoretically investigated in a compact and simple design of a metamaterial absorber, which consisted of a rectangle-shaped metallic resonator with an air gap and an insulating medium layer on top of a metallic mirror. Herein, four resonance peaks with nearly unity absorption were achieved in this structure. The patterned structures on the layer couple strongly to the incident waves at four different resonance modes, leading to the quad-band absorption responses. For the design of the absorber, complex and accurate alignment of elements can be avoided compared to previous multimer structures. Moreover, we demonstrated a tunable terahertz absorber by introducing photosensitive silicon material in the gap of the top layer resonator. Results show that the number of resonance peaks can be controlled from quad-band to dual-band by varying the silicon conductivity. This demonstration can, therefore, provide a simple and effective strategy or method for the design of multiple-band and even tunable metamaterial absorbers.
机译：在超材料吸收器的紧凑和简单设计中，理论上研究了四频带太赫兹吸收响应，该吸收器由一个带气隙的矩形金属谐振器和一个金属镜顶部的绝缘介质层组成。在此，在该结构中获得了具有几乎单位吸收的四个共振峰。该层上的图案化结构在四个不同的共振模式下强烈耦合到入射波，从而导致四频吸收响应。与先前的多聚体结构相比，对于吸收体的设计，可以避免元件的复杂而精确的对准。此外，我们通过将光敏硅材料引入顶层谐振器的间隙中，展示了一种可调谐的太赫兹吸收器。结果表明，可以通过改变硅的电导率来控制谐振峰的数量（从四频带到双频带）。因此，该演示可以为设计多波段甚至可调谐超材料吸收器提供简单有效的策略或方法。

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