An electromagnetic modulator based on electrically controllable metamaterial analogue to electromagnetically induced transparency.
An electromagnetic modulator based on electrically controllable metamaterial analogue to electromagnetically induced transparency.
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一种基于电控超材料的电磁调制器，类似于电磁感应透明
DOI：
10.1038/srep40441
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发表时间：
2017-01-16
影响因子：
4.6
通讯作者：
Li H
中科院分区：
文献类型：
--
作者：
Fan Y;Qiao T;Zhang F;Fu Q;Dong J;Kong B;Li H
电磁感应透明（Electromagnetically Induced Transparency，EIT）是一种很有前途的增强光-物质相互作用的技术，最近在人工微结构介质中实现的EIT模拟实验大大降低了对EIT光谱实验观测的极端要求。在本文中，我们提出了电控制类EIT光谱的超材料作为电磁调制器。作为可调电阻器的二极管被加载在成对导线的差距中以感应地调谐磁共振，这通过超材料样品在类EIT光谱上引起显著调制。实验测量证实了在类EIT光谱上的三个窄带中的电磁调制的预测，并且在通过超材料的透射上实现了高达31 dB的调制对比度。我们的研究结果可能有助于研究平移超材料中的主动/动力学技术，这些技术将超材料中光的流动连接起来，例如，外来的EIT，以及在工业中的实际应用。
Electromagnetically induced transparency (EIT) is a promising technology for the enhancement of light-matter interactions, and recent demonstrations of the EIT analogue realized in artificial micro-structured medium have remarkably reduced the extreme requirement for experimental observation of EIT spectrum. In this paper, we propose to electrically control the EIT-like spectrum in a metamaterial as an electromagnetic modulator. A diode acting as a tunable resistor is loaded in the gap of paired wires to inductively tune the magnetic resonance, which induces remarkable modulation on the EIT-like spectrum through the metamaterial sample. The experimental measurements confirmed that the prediction of electromagnetic modulation in three narrow bands on the EIT-like spectrum, and a modulation contrast of up to 31 dB was achieved on the transmission through the metamaterial. Our results may facilitate the study on active/dynamical technology in translational metamaterials, which connect extraordinary manipulations on the flow of light in metamaterials, e.g., the exotic EIT, and practical applications in industry.