论文标题
广角巨型光子旋转大厅效应
Wide-angle giant photonic spin Hall effect
论文作者
论文摘要
光子自旋大厅效应是光的自旋轨道相互作用的表现，可以通过与相反自旋的横向移位λof光子进行测量。横向移位的精确测量可以实现许多与自旋相关的应用，例如精确的计量和光学传感。但是，这种横向移位通常很小（即δ/λ<{10}^{ - 1}，λ是波长），这阻碍了其精确的测量。迄今为止生成巨大自旋效应的建议（即用δ/λ> {10}^{2}）具有严重的局限性，尤其是它仅在狭窄的角锥（Δθ<{1}}^{\ circ}的宽度上）。在这里，我们提出了一个通用方案，通过利用自由空间和单轴epsilon-near-Zero介质之间的界面来利用δθ> {70}^{\ Circ}实现广角巨型光子旋转厅效应。基本机制归因于在设计界面处的S和P极化波之间几乎完美的极化分裂。值得注意的是，这种几乎完美的极化分裂并不属于干扰效果，并且对入射角不敏感，然后产生广角巨型光子旋转厅效应。
Photonic spin Hall effect is a manifestation of spin-orbit interaction of light and can be measured by a transverse shift λof photons with opposite spins. The precise measurement of transverse shifts can enable many spin-related applications, such as precise metrology and optical sensing. However, this transverse shift is generally small (i.e. δ/λ<{10}^{-1}, λis the wavelength), which impedes its precise measurement. To-date proposals to generate giant spin Hall effect (namely with δ/λ>{10}^{2}) have severe limitations, particularly its occurrence only over a narrow angular cone (with a width of Δθ<{1}^{\circ}). Here we propose a universal scheme to realize the wide-angle giant photonic spin Hall effect with Δθ>{70}^{\circ} by exploiting the interface between free space and uniaxial epsilon-near-zero media. The underlying mechanism is ascribed to the almost-perfect polarization splitting between s and p polarized waves at the designed interface. Remarkably, this almost-perfect polarization splitting does not resort to the interference effect and is insensitive to the incident angle, which then gives rise to the wide-angle giant photonic spin Hall effect.
