用单个散射体分选偏振光子
Sorting polarized photons with a single scatterer
摘要：
直观地说，照射在空间对称物体上的光将对称地散射。如果适当调整入射光的偏振，这种直觉在纳米尺度上可能会失败。事实上，已经证明，近场干涉可以导致使用圆偏振光的等离子体激元模式的单向激发。在这里，我们表明，线性偏振的光子撞击在一个单一的空间对称的散射体中创建的硅波导被引导到波导的特定方向完全取决于他们的偏振角。互易性意味着散射体也可以充当辐射两个不同线性极化的双输入电介质纳米天线。我们的工作拓宽了近场干涉的范围，超越了等离子体激元，在偏振（解）复用，单向耦合，定向开关，辐射偏振控制和偏振编码的量子信息处理的光子集成电路中的应用。
英文摘要：
Intuitively, light impinging on a spatially symmetric object will be scattered symmetrically. This intuition can fail at the nanoscale if the polarization of the incoming light is properly tailored. In fact, it has been demonstrated that near-field interference can result in the unidirectional excitation of plasmonic modes using circularly polarized light. Here we show that linearly-polarized photons impinging on a single spatially-symmetric scatterer created in a silicon waveguide are guided into a certain direction of the waveguide depending exclusively on their polarization angle. Reciprocity implies that the scatterer can also act as a two-input dielectric nanoantenna radiating two different linear polarizations. Our work broadens the scope of near-field interference beyond plasmonics, with applications in polarization (de)multiplexing, unidirectional coupling, directional switching, radiation polarization control, and polarization-encoded quantum information processing in photonic integrated circuits.
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