Generation of Pure OAM Beams with a Single State of Polarization by Antenna-Decorated Microdisk Resonators
Language
en
Article de revue
This item was published in
ACS photonics. 2020-10-14, vol. 7, p. 3049 - 3060
American Chemical Society
English Abstract
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, ...Read more >
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.Read less <
English Keywords
3049−3060 Read Online Metrics & More Article Recommendations localized plasmons
microcavities
orbital angular momentum beams
polarization control
hybrid plasmonic−photonic resonators
phase-gradient metasurface
Fourier microscopy
Origin
Hal imported