银-光子晶体-银结构中两Tamm等离子体极化激元的耦合

Coupling of Two Tamm Plasmon Polaritons in Ag-photonic Crystal-Ag Structure

利用传输矩阵研究了银-光子晶体-银结构中两Tamm等离子体极化激元(TPPs)的耦合态。我们的数值结果表明当光子晶体的周期数n>10时,存在两本征波长相同的非耦合Tamm等离子体极化激元(非耦合TPPs),当n≤10时,两非耦合Tamm等离子体极化激元发生耦合,劈裂成两本征波长不同的耦合Tamm等离子体极化激元。随着n的减小,两耦合Tamm等离子体极化激元(耦合TPPs)间的劈裂能量增大,当n=3时,劈裂能量达到287.5meV。从银-光子晶体-银结构中的实时电场分布可以得到:本征波长较长的耦合TPP由两非耦合TPPs对称耦合产生,而本征波长较短的耦合TPP由两非耦合TPPs反对称耦合产生。

The coupled states of two Tamm Plasmon Polaritons（TPPs）in Ag-photonic crystal-Ag（Ag-PCAg）were studied by transfer matrix method.Our numerical results indicated that when the period number of photonic crystal n10,there were two uncoupled Tamm plasmon polaritons（uncoupled TPPs）with the same eigenwavelength.Two uncoupled TPPs couple,splitting into two coupled Tamm plasmon polaritons（coupled TPPs）with different eigenwavelength when n≤10.The splitting energy between two coupled TPPs increased with the decrease of n,and reached 287.5 meV when n=3.From the distribution of real part of electric field in the Ag-PC-Ag structure,it can be concluded that the coupled TPP with longer eigenwavelength originates in symmetric coupling between two uncoupled TPPs,while the coupled TPP with shorter eigenwavelength originates in asymmetric coupling between two uncoupled TPPs.