期刊
ACS PHOTONICS
卷 7, 期 11, 页码 3049-3060出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c01081
关键词
localized plasmons; microcavities; orbital angular momentum beams; polarization control; hybrid plasmonic-photonic resonators; phase-gradient metasurface; Fourier microscopy
类别
资金
- Dutch Research Council (NWO) [680.47.621]
- Investments for the Future program of IdEx Bordeaux
We report waveguide-addressed plasmonic-photonic resonators that generate beams of controlled orbital angular momentum and spin angular momentum content upon driving through a waveguide. From phase-gradient metasurfaces, we borrow the idea of carefully combining multiple nanoscale resonators in a repeat unit, from which we build periodic rings that decorate microdisk resonators. We describe the general mode structure of microdisk cavities perturbed by antenna arrays on the basis of a quasinormal mode formalism and present a strategy to simultaneously control the orbital and spin angular momentum content of light outcoupled to the far field. We propose a realization that uses silicon nitride disks and aluminum nanorod antennas. We find excellent polarization and orbital angular momentum (OAM) purity, as benchmarked by polarization-resolved interferometric Fourier microscopy on single devices.y
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