手征异膜自旋偶极子辐射的垂直路由
Vertical routing of spinning dipoles radiation from a chiral metamembrane
摘要：
我们提出了一个完美的光子路由器的基础上，一个专门设计的手性双超颖表面膜的自旋极化点光源。由于手征异膜中的镜像对称破缺，顺时针和逆时针旋转偶极子向板的相对侧的辐射功率通量变得不同。我们表明，在专门设计的手性D $_4$对称双超颖表面膜的自旋偶极子可以发射光向上或向下取决于他们的旋转方向。我们将这种现象归因于Fano共振效应，这是导模与远场耦合的结果。我们展示了D $_4$对称结构的优势，实现100\%的布线效率。这种现象可以在自旋电子学中用于自旋选择性芯片间耦合或作为存储器单元中自旋极化的测量工具。
英文摘要：
We propose a perfect photonic router based on a specially designed chiral bi-metasurface membrane for spin-polarized point light sources. Due to the mirror symmetry breaking in the chiral metamembrane, the radiation power flux of the clockwise and counterclockwise spinning dipoles to the opposite sides of the slab becomes different. We show that spinning dipoles in the specially designed chiral D$_4$-symmetrical bi-metasurface membrane can emit light either upwards or downwards depending on their rotation direction. We attribute this phenomenon to the Fano-resonance effect which is a result of the guided modes coupling with the far field. We show the advantage of D$_4$-symmetrical structures for the achievement of 100\% routing efficiency. This phenomenon can find applications in spintronics for spin-selective inter-chip coupling or as a measurement tool of spin polarization in memory cells.
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