电磁诱导类超变分子中局部电场增强的低功率阈值气体放电
Low-power threshold gas discharge by enhanced local electric field in electromagnetically-induced-transparencylike metamolecules
摘要：
为了实现高效的非线性超材料，我们研究了一种方法，用于增强局部电场的超分子组成的两个辐射耦合割线谐振器的割线谐振器的谐振和低群速度传播的入射电磁波同时发生。数值分析表明，在保持超分子等效电路参数不变的情况下，减小割线谐振器的电极尺寸和电容结构的间隙可以增强超分子中的局域电场.我们测量并比较了在我们以前的研究中制造的超分子和具有收缩电容器结构的超分子中的气体放电的阈值入射功率。实验表明，在保持超分子谐振频率的同时，缩小电容器结构会降低气体放电的阈值入射功率，并可能增加阈值入射功率最小处的气体压力。这项工作的进一步发展将使我们能够实现高效的非线性超材料，大气压气体作为非线性元件。
英文摘要：
To realize efficient nonlinear metamaterials, we investigate a method for enhancing the local electric field in a metamolecule composed of two radiatively coupled cut-wire resonators where resonance of the cut-wire resonators and low-group-velocity propagation of an incident electromagnetic wave simultaneously occur. Numerical analysis shows that the local electric field in the metamolecule can be enhanced by decreasing the electrode size and the gap of the capacitor structure of the cut-wire resonators while keeping the equivalent electrical circuit parameters of the metamolecule constant. We measure and compare the threshold incident power for a gas discharge in the metamolecule fabricated in our previous study and that in the metamolecule with shrunken capacitor structures. The experiment reveals that shrinking the capacitor structure while keeping the resonance frequency of the metamolecule decreases the threshold incident power for a gas discharge and may increase the gas pressure where the threshold incident power is minimum. Further development of this work will enable us to realize efficient nonlinear metamaterials that have atmospheric-pressure gas as a nonlinear element.
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