Generation of Pure OAM Beams with a Single State of Polarization by Antenna-Decorated Microdisk Resonators - Archive ouverte HAL Access content directly
Journal Articles ACS photonics Year : 2020

Generation of Pure OAM Beams with a Single State of Polarization by Antenna-Decorated Microdisk Resonators

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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, 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.
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Dates and versions

hal-03038304 , version 1 (03-12-2020)

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Kévin G Cognée, Hugo M Doeleman, Philippe Lalanne, A Femius Koenderink. Generation of Pure OAM Beams with a Single State of Polarization by Antenna-Decorated Microdisk Resonators. ACS photonics, 2020, 7, pp.3049 - 3060. ⟨10.1021/acsphotonics.0c01081⟩. ⟨hal-03038304⟩
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