Analysis and modeling of Fano resonances using equivalent circuit elements.
Analysis and modeling of Fano resonances using equivalent circuit elements.
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DOI：
10.1038/srep31884
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发表时间：
2016-08-22
影响因子：
4.6
通讯作者：
Ma R
中科院分区：
文献类型：
--
作者：
Lv B;Li R;Fu J;Wu Q;Zhang K;Chen W;Wang Z;Ma R
Fano共振呈现出由连续谱与离散自电离态耦合干涉形成的非对称线形。在本文中，我们展示了几个简单的电路Fano谐振从稳定的输入阻抗机制，其中的元素组成的电感器和电容器配制为各种谐振模式，和电阻代表的振荡器的阻尼。通过调节输入阻抗的零极点，一个简单的电路只有三个无源元件，如两个电感和一个电容，可以灵活地表现出任意Q值的非对称谐振。同时，四个无源元件可以表现出各种谐振，包括洛伦兹类和电磁感应透明（EIT）的形成。我们的工作不仅提供了对Fano谐振的直观理解，而且还为使用简单电路元件实现Fano谐振铺平了道路。
Fano resonance presents an asymmetric line shape formed by an interference of a continuum coupled with a discrete autoionized state. In this paper, we show several simple circuits for Fano resonances from the stable-input impedance mechanism, where the elements consisting of inductors and capacitors are formulated for various resonant modes, and the resistor represents the damping of the oscillators. By tuning the pole-zero of the input impedance, a simple circuit with only three passive components e.g. two inductors and one capacitor, can exhibit asymmetric resonance with arbitrary Q-factors flexiblely. Meanwhile, four passive components can exhibit various resonances including the Lorentz-like and reversely electromagnetically induced transparency (EIT) formations. Our work not only provides an intuitive understanding of Fano resonances, but also pave the way to realize Fano resonaces using simple circuit elements.