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

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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https://hal-iogs.archives-ouvertes.fr/hal-03038304
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Submitted on : Thursday, December 3, 2020 - 2:09:09 PM
Last modification on : Tuesday, December 15, 2020 - 3:32:08 AM

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

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