基于纳米光纤的布里渊散射中的自旋-轨道相互作用
Spin-orbit interaction in nanofiber-based Brillouin scattering
AI总结：
本文通过理论和实验研究纳米光纤中圆偏振光与横向涡旋声波之间的自旋-轨道相互作用，揭示泵浦圆偏振时背向散射布里渊信号因总角动量守恒发生圆偏振手性反转。
摘要：
角动量是一种重要的物理性质，在光与物质相互作用（如自旋-轨道相互作用）中起着关键作用。本文从理论和实验两方面研究了在二氧化硅光学纳米光纤中，利用布里渊背向散射，圆偏振光（自旋）与横向涡旋声波（轨道）之间的自旋-轨道相互作用。我们特别探索了由携带轨道角动量的TR21体-径向涡旋声学模式诱导的布里渊背向散射的偏振态。利用全矢量理论模型，我们预测并观察到了两种工作状态：背向散射布里渊信号取决于输入泵浦偏振，要么退偏振，要么圆偏振。我们证明，当泵浦为圆偏振并因此携带自旋角动量时，由于光声自旋-轨道相互作用以及总角动量守恒，背向散射信号会发生圆偏振的手性反转。
英文摘要：
Angular momentum is an important physical property that plays a key role in light-matter interactions such as spin-orbit interaction. Here, we investigate theoretically and experimentally the spin-orbit interaction between a circularly polarized optical (spin) and a transverse vortex acoustic wave (orbital) using Brillouin backscattering in a silica optical nanofiber. We specifically explore the state of polarization of Brillouin backscattering induced by the TR21 torso-radial vortex acoustic mode that carries an orbital angular momentum. Using a full-vectorial theoretical model, we predict and observe two operating regimes for which the backscattered Brillouin signal is either depolarized or circularly polarized depending on the input pump polarization. We demonstrate that when the pump is circularly polarized and thus carries a spin angular momentum, the backscattered signal undergoes a handedness reversal of circular polarization due to optoacoustic spin-orbit interaction and the conservation of overall angular momentum.
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