论文标题
几何相位上的自旋摩托明锁定的微观分析
Microscopic analysis of spin-momentum locking on a geometric phase metasurface
论文作者
论文摘要
我们重新访问由旋转的纳米栓塞组成的等离子体浆果跨表面中的自旋轨道耦合，该纳米栓塞已知可以烙印出强大的远场极化响应。我们提出了一种散射形式主义，该形式显示了如何从单位电池的几何形状中出现这种自旋旋转的形式，而无需全局旋转对称性。我们发现并通过Mueller极化测量测量确认自旋摩托明锁定是近似对称性。对称分解归因于圆形偏振光到平面表面的椭圆形投影。当表面波被激发时，这种崩溃是最大的，并且针对这种情况提出了一组新的自旋摩托明锁定规则。
We revisit spin-orbit coupling in a plasmonic Berry metasurface comprised of rotated nanoapertures, which is known to imprint a robust far-field polarization response. We present a scattering formalism that shows how that spin-momentum locking emerges from the geometry of the unit cell without requiring global rotation symmetries. We find and confirm with Mueller polarimetry measurements that spin-momentum locking is an approximate symmetry. The symmetry breakdown is ascribed to the elliptical projection of circularly polarized light into the planar surface. This breakdown is maximal when surface waves are excited, and a new set of spin-momentum locking rules is presented for this case.
