非对称金属薄膜等离子体波导的磁调谐截止
Magnetically-tunable cutoff in asymmetric thin metal film plasmonic waveguide
摘要：
我们从理论上研究了在一侧被磁光材料包围，另一侧被磁光介质包围的金属薄膜中长程表面等离子体激元的磁调谐截止。解析推导的截止条件预测，一个磁场偏置可以诱导一个新的退化截止状态附近的超过截止辐射在一侧可以切换到在另一侧的一个微小的变化的磁场从偏置。简并所需的磁化偏置与金属膜厚度成正比，与波长成反比。
英文摘要：
We theoretically investigated the magnetically-tunable cutoff of long-range surface plasmon polariton along thin metal film surrounded by a magneto-optic material on one side and by a nonmagnetic dielectric on the other side. The analytically derived cutoff condition predicts that a magnetic field bias can induce a novel degenerate cutoff-state near which the beyond-cutoff radiation in one side can be switched to that in the other side by a minor variation of the magnetic field from the bias. The magnetization bias needed for the degeneracy is in proportion to the metal film thickness and in inverse proportion to the wavelength.
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