Eigenmode hybridization enables lattice-induced transparency in symmetric terahertz metasurfaces for slow light applications
Eigenmode hybridization enables lattice-induced transparency in symmetric terahertz metasurfaces for slow light applications
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DOI：
10.1364/ol.44.002705
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发表时间：
2019-06
期刊：
影响因子：
3.6
通讯作者：
J. Burrow;R. Yahiaoui;A. Sarangan;J. Mathews;I. Agha;T. Searles
中科院分区：
文献类型：
--
作者：
J. Burrow;R. Yahiaoui;A. Sarangan;J. Mathews;I. Agha;T. Searles
传统的晶格诱导透明演示通过改变元原子晶格常数来激活，使得等离子体和晶格模式干涉。在这里，我们报告的观察增强耦合两个本征模（第一和第二阶）通过改变晶格参数在对称开口环谐振器的设计。高阶准暗模发生蓝移，在345 μm以上的周期内与基亮模发生强耦合。数值模拟实验验证，并补充了两个振荡器模型显示出良好的协议。此外，更大的正群延迟值在具有最小吸收的透明窗口附近实现，表明慢光应用的强大潜力。
Traditional lattice-induced transparency demonstrations are activated by varying the meta-atom lattice constant such that the plasmonic and lattice modes interfere. Here we report on the observation of enhanced coupling between two eigenmodes (first- and second-order) by varying the lattice parameter in a symmetric split ring resonator design. The higher-order quasi-dark mode blueshifts, introducing strong coupling with the fundamental bright mode for periods above 345 μm. Numerical simulations are verified experimentally and supplemented with a two-oscillator model showing good agreement. Furthermore, larger positive group delay values are achieved in the vicinity of the transparency window with minimal absorption, indicating a strong potential for slow light applications.