Han Song, Cong Longqing, Lin Hai, Xiao Boxun, Yang Helin, Singh Ranjan
College of physical science and technology, Central China Normal University, Wuhan 430079, China.
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
Sci Rep. 2016 Feb 9;6:20801. doi: 10.1038/srep20801.
Metamaterials have recently enabled coupling induced transparency due to interference effects in coupled subwavelength resonators. In this work, we present a three dimensional (3-D) metamaterial design with six-fold rotational symmetry that shows electromagnetically induced transparency with a strong polarization dependence to the incident electromagnetic wave due to the ultra-sharp resonance line width as a result of interaction between the constituent meta-atoms. However, when the six-fold rotationally symmetric unit cell design was re-arranged into a fourfold rotational symmetry, we observed the excitation of a polarization insensitive dual-band transparency. Thus, the 3-D split-ring resonators allow new schemes to observe single and multi-band classical analogues of electromagnetically induced transparencies that has huge potential applications in slowing down light, sensing modalities, and filtering functionalities either in the passive mode or the active mode where such effects could be tuned by integrating materials with dynamic properties.
超材料最近通过耦合亚波长谐振器中的干涉效应实现了耦合诱导透明。在这项工作中，我们提出了一种具有六重旋转对称性的三维（3-D）超材料设计，由于组成元原子之间的相互作用导致超尖锐的共振线宽，该设计对入射电磁波表现出具有强偏振依赖性的电磁诱导透明。然而，当将六重旋转对称的单元胞设计重新排列成四重旋转对称时，我们观察到了一种偏振不敏感的双波段透明的激发。因此，3-D 裂环谐振器允许采用新的方案来观察电磁诱导透明的单波段和多波段经典类似物，这在被动模式或主动模式下减慢光、传感模式以及滤波功能等方面具有巨大的潜在应用，在主动模式下，可以通过将材料与动态特性相结合来调节此类效应。
