论文标题
三维微腔中光的自旋轨道相互作用
Spin-orbit interaction of light in three-dimensional microcavities
论文作者
论文摘要
我们研究了三维圆柱和管状耳语库模式谐振器中光的自旋轨道耦合。我们表明，即使在没有不均匀性或各向异性的情况下，它的起源是在谐振墙中光的横向限制。自旋轨道相互作用导致椭圆形远场极化（自旋）状态，并导致远场中极化的空间分离。对于沿着谐振器高度较高的激发库的耳语画廊模式，椭圆度和空间分离得到了增强。我们分析了圆锥形微腔的远场中椭圆度的不对称性和极化方向的倾斜。此外，我们发现远场偏振方向的倾斜与谐振壁的局部倾向之间存在直接关系。我们的发现基于FDTD仿真，并由三维衍射理论支持。
We investigate the spin-orbit coupling of light in three-dimensional cylindrical and tube-like whispering gallery mode resonators. We show that its origin is the transverse confinement of light in the resonator walls, even in the absence of inhomogeneities or anisotropies. The spin-orbit interaction results in elliptical far-field polarization (spin) states and causes spatial separation of polarization handedness in the far field. The ellipticity and spatial separation are enhanced for whispering gallery modes with higher excitation numbers along the resonator height. We analyze the asymmetry of the ellipticity and the tilt of the polarization orientation in the far field of cone-like microcavities. Furthermore, we find a direct relationship between the tilt of the polarization orientation in the far field and the local inclination of the resonator wall. Our findings are based on FDTD-simulations and are supported by three-dimensional diffraction theory.
