Electromagnetically Induced Transparency and Absorption in Metamaterials: The Radiating Two-Oscillator Model and Its Experimental Confirmation
Electromagnetically Induced Transparency and Absorption in Metamaterials: The Radiating Two-Oscillator Model and Its Experimental Confirmation
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DOI：
10.1103/physrevlett.109.187401
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发表时间：
2012-10-31
影响因子：
8.6
通讯作者：
Soukoulis, Costas M.
中科院分区：
文献类型：
--
作者：
Tassin, Philippe;Zhang, Lei;Soukoulis, Costas M.
在超材料中电磁感应透明的几个经典的类似物已经被证明。一个简单的双谐振腔模型可以定性地描述它们的吸收光谱，但是不能提供关于散射特性的信息，例如，传输和群延迟。在这里，我们开发了一个替代模型，严格包括耦合的辐射谐振器的外部电磁场。这种辐射双振子模型可以定量地描述吸收谱和散射参数。该模型还预测了超材料的吸收比辐射元件的背景吸收大的窄光谱特征。电磁感应吸收的经典模拟示出发生时，辐射谐振器的耗散损耗和耦合强度都很小。这些预测随后在实验中得到证实。
Several classical analogues of electromagnetically induced transparency in metamaterials have been demonstrated. A simple two-resonator model can describe their absorption spectrum qualitatively, but fails to provide information about the scattering properties-e.g., transmission and group delay. Here we develop an alternative model that rigorously includes the coupling of the radiative resonator to the external electromagnetic fields. This radiating two-oscillator model can describe both the absorption spectrum and the scattering parameters quantitatively. The model also predicts metamaterials with a narrow spectral feature in the absorption larger than the background absorption of the radiative element. This classical analogue of electromagnetically induced absorption is shown to occur when both the dissipative loss of the radiative resonator and the coupling strength are small. These predictions are subsequently demonstrated in experiments.