塞曼分裂模超散射的三维不可见性
Three-Dimensional Invisibility to Superscattering Induced by Zeeman-Split Modes
摘要：
我们报道了在磁光辅助系统中，通过诱导非简并磁等离子体激元模，可以克服基本的三维（3-D）散射单通道极限。此外，我们提出了一个3-D主动（磁辅助）前向超散射隐形开关，在相同的工作波长。我们的结构是由一个高折射率的电介质核心涂覆的锑化铟（InSb），半导体的介电常数张量元素可以主动操纵的外部磁偏置$B_0$。在没有$B_0$的情况下，InSb分别在其等离子体频率之上和之下表现出各向同性的ε近零（ENZ）和等离子体行为，该等离子体频率是可以用于使用介电常数小于自由空间的介电常数的斗篷来实现不可见性的频带。与现实的$B_0$幅度高达0.17 T，旋电性能的锑化铟，使电梯的模式简并，和感应的塞曼分裂型偶极磁等离子体模式，击败基本的单通道限制。这种一体化设计允许实现功能和高度可调的光学器件。
英文摘要：
We report that the fundamental three-dimensional (3-D) scattering single-channel limit can be overcome in magneto-optical assisted systems by inducing nondegenerate magnetoplasmonic modes. In addition, we propose a 3-D active (magnetically assisted) forward-superscattering to invisibility switch, functioning at the same operational wavelength. Our structure is composed of a high-index dielectric core coated by indium antimonide (InSb), a semiconductor whose permittivity tensorial elements may be actively manipulated by an external magnetic bias $B_0$. In the absence of $B_0$, InSb exhibits isotropic epsilon-near-zero (ENZ) and plasmonic behavior above and below its plasma frequency, respectively, a frequency band which can be utilized for attaining invisibility using cloaks with permittivity less than that of free space. With realistic $B_0$ magnitudes as high as 0.17 T, the gyroelectric properties of InSb enable the lift of mode degeneracy, and the induction of a Zeeman-split type dipolar magnetoplasmonic mode that beats the fundamental single-channel limit. This all-in-one design allows for the implementation of functional and highly tunable optical devices.
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