Harnessing the Frozen-mode in Coupled Silicon Ridge Waveguides for True Time Delay Applications
Harnessing the Frozen-mode in Coupled Silicon Ridge Waveguides for True Time Delay Applications
复制标题
利用耦合硅脊波导中的冻结模式实现真正的时延应用
DOI：
10.1109/iceaa.2019.8878919
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
K. Sertel
中科院分区：
文献类型：
--
作者：
Banaful Paul;N. Nahar;K. Sertel
周期性的材料排列和复杂的超材料结构通过设计它们的色散来实现非常规的功能，从而实现了操纵光的新方法。在各向异性磁光子复合材料中，由模式简并引起的异常慢模或冻结模是色散工程中最奇特的表现之一。特别是，冻结模式只能通过同时击穿体各向异性超材料的时间和空间反转对称性来实现。因此，它们必须在其结构中包括偏磁材料。然而，同样的冻结模式现象可以更容易地实现在全介质光波导通过引入更多的自由度使用多个耦合段。由于多条传输线提供的色散图中有2个以上的分支，因此可以引入3路耦合并调整色散以在传播带内表现出最大的平坦行为。此外，由于在所谓的静止拐点（SIP）的模式简并，耦合到冻结模式变得容易实现。利用3路耦合周期波导和耦合谐振腔光波导在[2]中研究了这种模式。
Periodic material arrangements and sophisticated metamaterial structures have enabled novel ways of manipulating light by engineering their dispersion to achieve unconventional functionality. Extraordinarily-slow or frozen-modes stemming from mode degeneracy in anisotropic magnetic photonic composites are among the most exotic manifestations of dispersion engineering. In particular, the frozen modes are only enabled by the simultaneous breakdown of time and space inversion symmetries in bulk anisotropic metamaterials. As such, they must include biased magnetic materials in their construction [1]. However, the same frozen-mode phenomena can be more readily achieved in all-dielectric light waveguides by introducing more degrees of freedom using multiple coupled sections. With more-than-2 branches in the dispersion diagram afforded by the multiple transmission lines, it is hence possible to introduce 3-way coupling and tune the dispersion to exhibit a maximally-flat behavior within the propagation band. Moreover, due to mode degeneracy at the so-called stationary inflection point (SIP), coupling into the frozen-mode becomes readily achievable. Such modes have been studied in [2] using 3-way coupled periodic waveguides and coupled resonator optical waveguides in [3].