Enhancement of spin components’ shifts of reflected beam via long range surface plasmon resonance
Enhancement of spin components’ shifts of reflected beam via long range surface plasmon resonance
复制标题
通过长程表面等离子体共振增强反射光束的自旋分量和位移
DOI：
10.1016/j.optcom.2018.04.070
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发表时间：
2018-11
影响因子：
2.4
通讯作者：
Qinggang Liu
中科院分区：
文献类型：
--
作者：
Zirui Qin;Chong Yue;Yaopu Lang;Qinggang Liu
本文研究了长程表面等离子体共振（LRSPR）对p偏振高斯光束经玻璃-石英-金-石英界面反射后的左、右自旋分量的空间位移和角位移的影响，并推导了这些位移的计算公式。我们发现，左右自旋分量的空间和角自旋分裂只发生在垂直于入射面的方向（面外），而不发生在平行于入射面的方向（面内）。左、右自旋分量的平面内空间位移和角位移是相同的，等于总反射光束的平面内空间位移（即角位移和空间古斯-汉欣位移）。我们发现，所有的面内和面外位移可以大大增强LRSPR。最大角位移和空间面内位移分别可达1.060× 10− 4 rad和249.977 μ m，几乎等于入射高斯光束发散角和束腰的一半。最大的空间面内位移（约20.148 μ m）是以前报道的增强值的5倍。我们还发现，在一定条件下，通过调节入射角、熔融石英膜或金膜的厚度，可以控制平面内和平面外的角位移和空间位移的方向和大小，这可能为光子操纵提供了一种新的途径.此外，我们的工作可能会提供一些帮助的物理和生物参数的精确测量和SPR传感技术的发展。
In this letter, we investigated the impact of long range surface plasmon resonance (LRSPR) on the spatial and angular shifts of left and right spin components of a p-polarization Gaussian beam reflected from a glass-fused silica-gold-fused silica interface, and deduced the formulas of these shifts. We found that the spatial and angular spin splitting of left and right spin components only occur in the direction perpendicular to the plane of incidence (out-of-plane), but not in the direction parallel to the plane of incidence (in-plane). The spatial and angular in-plane shifts of left and right spin components are the same, which are equal to those of the total reflected beam (ie, angular and spatial Goos–Hänchen shifts). We found that all the in-plane and out-of-plane shifts can be greatly enhanced by LRSPR. The maximum angular and spatial in-plane shifts can be up to 1.060× 10− 4 rad and 249.977 μ m, respectively, which are almost equal to half of the divergence angle and beam waist of the incident Gaussian beam. The maximum spatial in-plane shift (about 20.148 μ m) is about 5 times larger than the previously reported enhanced value. We also found that the directions and magnitude of angular and spatial in-plane and out-of-plane shifts can be controlled by slightly adjusting the angle of incidence or the thickness of fused silica film or gold film under certain conditions, which may provide a new way for photon manipulation. Furthermore, our work may provide some help for precision measurement of physical and biological parameters and the development of SPR sensing technology.
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