具有全球唯一旋向性的光的横向旋转
Transverse spinning of light with globally unique handedness
摘要：
对光的横向自旋的研究开启了拓扑光子学和光力学的新领域。为了实现非零纵向场的横向自旋，已经提出了基于聚焦、干涉或倏逝波来获得横向约束波的各种平台。然而，由于横向限制固有地伴随着场导数的符号反转，所产生的横向自旋旋向性经历空间反转，这导致波函数的密度与其自旋分量之间的失配，并阻碍了横向自旋的全局观测。在这里，我们揭示了一个全球性的纯横向自旋的波函数密度表示的自旋分布，通过采用本征模在自旋基础的逆模。从目标的自旋轮廓，我们解析地获得潜在的景观，然后表明，椭圆双曲过渡附近的ε-近零介电常数允许跨各向异性超材料之间的拓扑界面的横向自旋旋向性的全局守恒。扩展到非厄米政权，我们还开发了湮灭的横向自旋模式，以覆盖整个庞加莱球的双曲平面。我们的结果使光能完全转移到横向自旋运动，实现了三维量子自旋态的经典类比。
英文摘要：
Access to the transverse spin of light has unlocked new regimes in topological photonics and optomechanics. To achieve the transverse spin of nonzero longitudinal fields, various platforms that derive transversely confined waves based on focusing, interference, or evanescent waves have been suggested. Nonetheless, because of the transverse confinement inherently accompanying sign reversal of the field derivative, the resulting transverse spin handedness experiences spatial inversion, which leads to a mismatch between the densities of the wavefunction and its spin component and hinders the global observation of the transverse spin. Here, we reveal a globally pure transverse spin in which the wavefunction density signifies the spin distribution, by employing inverse molding of the eigenmode in the spin basis. Starting from the target spin profile, we analytically obtain the potential landscape and then show that the elliptic-hyperbolic transition around the epsilon-near-zero permittivity allows for the global conservation of transverse spin handedness across the topological interface between anisotropic metamaterials. Extending to the non-Hermitian regime, we also develop annihilated transverse spin modes to cover the entire Poincare sphere of the meridional plane. Our results enable the complete transfer of optical energy to transverse spinning motions and realize the classical analogy of 3-dimensional quantum spin states.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
