Asymmetric excitation of surface plasmons by dark mode coupling.
Asymmetric excitation of surface plasmons by dark mode coupling.
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暗模式耦合表面等离子体激元的不对称激发
DOI：
10.1126/sciadv.1501142
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发表时间：
2016-02
期刊：
影响因子：
13.6
通讯作者：
Zhang W
中科院分区：
文献类型：
--
作者：
Zhang X;Xu Q;Li Q;Xu Y;Gu J;Tian Z;Ouyang C;Liu Y;Zhang S;Zhang X;Han J;Zhang W
表面等离子体激元的非对称激发是通过经典的暗模耦合实现的，具有独特功能的有前途的元器件。表面等离子体激元（SP）的控制在各种尖端应用中是必不可少的，例如高度集成的光子信号处理系统，深亚波长激光，高分辨率成像和超灵敏的生物医学检测。近年来，SPs的不对称激发引起了人们极大的兴趣。在自由空间中，超材料中的电磁感应透明（EIT）模拟已被广泛研究，以独特地操纵电磁波。在近场，我们表明，暗模式耦合机制的经典EIT效应，使一个奇异的和直接的激发SP的超颖表面系统。这不仅导致非对称SP的共振激发，而且通过使用惠更斯-菲涅耳原理还导致可控的奇异SP聚焦。我们的实验结果表明，开发具有独特功能的等离子体元器件的潜力。
Asymmetric excitation of surface plasmons is achieved by classical dark mode coupling, promising metadevices with unique functionalities. Control over surface plasmons (SPs) is essential in a variety of cutting-edge applications, such as highly integrated photonic signal processing systems, deep-subwavelength lasing, high-resolution imaging, and ultrasensitive biomedical detection. Recently, asymmetric excitation of SPs has attracted enormous interest. In free space, the analog of electromagnetically induced transparency (EIT) in metamaterials has been widely investigated to uniquely manipulate the electromagnetic waves. In the near field, we show that the dark mode coupling mechanism of the classical EIT effect enables an exotic and straightforward excitation of SPs in a metasurface system. This leads to not only resonant excitation of asymmetric SPs but also controllable exotic SP focusing by the use of the Huygens-Fresnel principle. Our experimental findings manifest the potential of developing plasmonic metadevices with unique functionalities.