Spin-orbit interaction of light in three-dimensional microcavities
arXiv:2007.06721 · doi:10.1103/PhysRevA.102.043524
Abstract
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.
18 pages, 6 figures
References in corpus (6)
- Geometrodynamics of Spinning Light
- Wavelength- and material-dependent absorption in GaAs and AlGaAs microcavities
- Three-Dimensionally Confined Optical Modes in Quantum Well Microtube Ring Resonators
- Aharonov-Bohm Physics with Spin I: Geometric Phases in One-dimensional Ballistic Rings
- Spin Photonics in 3D Whispering Gallery Mode Resonators
- The 3D Limaçon: Properties and Applications