摘要
研究了在外加恒定磁场下,旋磁材料柱按蜂窝状晶格排列的光子晶体平板的边界所支持的电磁表面波模式。研究首先表明,在光子晶体平板的光子能带结构中,最低二条能量曲线原有的简并点,可以用外加磁场来解除,从而在这二个能带之间形成一个禁带。进一步的研究表明,基于这个光子禁带,光子晶体板平板边界所支持的表面波模式只能单方向传播,归因于系统的时间反演对称性被外磁场所破坏。这个三维系统中的单向边界模式,在平板的法向方向上,是依赖于等效全反射效应而被约束的。
The modes of electromagnetic surface waves sustained by the edge of a photonic crystal slab consisting of a honeycomb array of gyromagnetic material columns were investigated when an external dc magnetic field was applied to it. It is firstly demonstrated that in the photonic band structure of this photonic crystal slab, the original degeneracy point of the lowest two （photonic） energy curves can be lifted by applying an external magnetic field, thus forming a band gap between the two bands. Furthermore, it is demonstrated that based on this sort of band gap, surface mode sustained by the edge of the photonic crystal slab can propagate only in one direction, attributing to the time-reversal symmetry of the system broken by the external magnetic field. With the effective total internal reflection effect, the unidirectional edge mode in this three-dimensional system is confined in the direction normal to the photonic crystal slab.
出处
《量子电子学报》
CAS
CSCD
北大核心
2013年第2期213-218,共6页
Chinese Journal of Quantum Electronics
基金
安徽省教育厅资助项目(0942)
关键词
光纤与波导光学
fiber and waveguide optics
one-way wave propagation
finite element method
gyromagnetic material
