光学学报, 2013, 33 (9): 0916002, 网络出版: 2013-08-08
利用光子晶体调控表面等离极化激元
Surface-Plasmon-Polariton Manipulation Using Photonic Crystals
表面光学 表面等离极化激元 色散关系 光子能带结构 单向传播 optics at surfaces surface plasmon polaritons dispersion relation photonic band structure one-way propagation
摘要
研究了空气/金属介质超晶格结构界面处的表面等离极化激元。采用传输矩阵法,得到了金属介质层状超晶格结构的能带分布以及表面等离极化激元色散曲线,发现通过调节界面处金属层厚度可以有效地调控表面电磁模式分布。若在金属层中外加静磁场,破坏了系统的时间反演对称性,表面等离极化激元表现出非倒易的特性。尤其在一定频率区间,会出现单方向传播的表面等离极化激元。
Abstract
The existence of surface plasmon polaritons (SPPs) at the interface between air/metal-dielectric layered systems is demonstrated. Using the transfer matrix method, we calculate the band structure of periodic metal-dielectric layered system and the dispersion relation of SPPs. It is found that we can effectively tune surface modes by varying the thickness of the top metal layer. Moreover, in the presence of static magnetic field, the time reversal symmetry of systems is broken, and nonreciprocal SPPs can be gotten. In particular, such a system can provide a frequency range where one-way SPPs are allowed.
董慧媛, 王进. 利用光子晶体调控表面等离极化激元[J]. 光学学报, 2013, 33(9): 0916002. Dong Huiyuan, Wang Jin. Surface-Plasmon-Polariton Manipulation Using Photonic Crystals[J]. Acta Optica Sinica, 2013, 33(9): 0916002.