Enhanced Photonic Spin Hall Effect Due to Surface Plasmon Resonance
Enhanced Photonic Spin Hall Effect Due to Surface Plasmon Resonance
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DOI：
10.1109/jphot.2016.2523253
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发表时间：
2016-01
影响因子：
2.4
通讯作者：
Xinxing Zhou;Xiaohui Ling
中科院分区：
文献类型：
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作者：
Xinxing Zhou;Xiaohui Ling
在本文中，我们考虑表面等离子体共振（SPR）效应，理论上研究了由玻璃、金属和空气组成的三层结构中的光子自旋霍尔效应（SHE）。结果表明，当入射角接近共振角时，光子SHE中自旋相关的分裂远大于先前报道的折射结果。这一有趣现象背后的内在物理原因是SPR周围菲涅耳反射系数的急剧下降。我们还发现，存在一个最佳的厚度最小的谐振反射，在此之上的巨大的光束位移也被观察到。这些发现为我们提供了一条调节光子SHE的途径，并为开发纳米光子应用（如基于SPR的传感器）提供了可能性。
In this paper, by considering the surface plasmon resonance (SPR) effect, we theoretically study the photonic spin Hall effect (SHE) in a three-layer structure composed of glass, metal, and air. It is revealed that the obtained spin-dependent splitting in photonic SHE is far greater than the previously reported results in refraction when the incident angle is near the resonant angle. The inherent physics behind this interesting phenomenon is attributed to the sharp decrease in Fresnel reflective coefficients around the SPR. We also find that there exists an optimal thickness for minimal resonant reflection, above which the huge beam displacement is also observed. These findings provide us a pathway for modulating the photonic SHE and open the possibility of developing nanophotonic applications such as the SPR-based sensor.