Jie Chen, Yawei Tan, Rong Wang, Qiang Zhou, yong cao, Xiaohui Ling
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引用次数: 0
摘要
光的自旋轨道相互作用(SOI)表现为自旋偏振光束正常撞击光学界面时产生的自旋相关涡流束。然而,这种 SOI 过程的自旋动量性质仍然难以捉摸,这阻碍了进一步的操作。在这里,我们利用全波理论系统地研究了这种 SOI 过程中透射光束的自旋动量特性。透射光束有三个分量,即自旋保持正常模式、自旋反转异常模式和纵向分量。通过将总自旋角动量分解为横向自旋角动量(T-SAM)和与螺旋相关的纵向自旋角动量(L-SAM),我们证明 L-SAM 主导正常模式的总自旋角动量,而 T-SAM 则决定异常模式的总自旋角动量。其基本物理原理是正常模式的权重远大于纵向场,而异常模式的权重与纵向场相当。这项研究丰富了人们对光的 SOI 的自旋动量性质的理解,并为操纵光的角动量提供了新的机遇。
Spin-momentum properties of the spin-orbit interactions of light at optical interfaces
The spin-orbit interaction (SOI) of light manifests as the generation of spin-dependent vortex beams when a spin-polarized beam strikes an optical interface normally. However, the spin-momentum nature of this SOI process remains elusive, which impedes further manipulation. Here, we systematically investigate the spin-momentum properties of the transmitted beam in this SOI process using a full-wave theory. The transmitted beam has three components, a spin-maintained normal mode, a spin-reversed abnormal mode, and a longitudinal component. By decomposing the total spin angular momentum (SAM) into the transverse SAM (T-SAM) and the helicity dependent longitudinal SAM (L-SAM), we demonstrate that the L-SAM dominates the total SAM of the normal mode, while the T-SAM dictates that of the abnormal mode. The underlying physics is that the normal mode exhibits a much larger weight than the longitudinal field, while the abnormal mode has a weight comparable to the longitudinal field. This study enriches the understanding of the spin-momentum nature of light's SOI and offers new opportunities for manipulating light's angular momentum.