Angular-momentum coupling of optical whispering-gallery modes to liquid droplet microresonators

Year: 2021

Authors: D’Ambrosio D., Zambrana-Puyalto X., Capezzuto M., Giorgini A., Malara P., Avino S., Gagliardi G.

Autors Affiliation: CNR, Ist Nazl Ott INO, Via Catnpi Flegrei 34, I-80078 Pozzuoli, Italy; Ist Italiano Tecnol, Via Morego 30, I-16136 Genoa, Italy.

Abstract: Starting from a recently developed model based on the generalized Lorenz-Mie theory, we simulate and experimentally investigate the resonance spectrum and the scattered light field of whispering-gallery modes (WGMs) in a liquid droplet excited with a free-space visible laser beam. Depending on the illumination configuration and the spectral region, we observe WGMs with diverse quality factors and coupling efficiencies. Through imaging of scattering patterns, we show a robust agreement between theory and experiment. Our study provides an insight of the free-space optical coupling phenomenon, opening pathways for a controlled excitation of ultrahigh-quality WGMs in a plethora of liquid and solid optical microresonators for sensing and imaging applications.

Journal/Review: PHYSICAL REVIEW A

Volume: 104 (4)      Pages from: 043504-1  to: 043504-6

More Information: The authors are grateful to Marco Conti, Andrea Passarella, and Claudio Cicconetti for the availability of the CNR-IIT high-performance computer facility. The authors are grateful to G. Notariale for technical assistance. X.Z-P. acknowledges funding from the European Union´s Horizon 2020 research and innovation programme under the Marie SklodowskaCurie Grant Agreement No. 795838. The experimental work and Davide D´Ambrosio´s fellowship were funded by the Italian Ministry for University & Research (MUR) in the framework of the PRIN2017 PELM project (20177PSCKT grant).
KeyWords: Angular momentum of light, Mie scattering, optical microcavities, whispering gallery modes resonators
DOI: 10.1103/PhysRevA.104.043504

Citations: 6
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