Scientific Results

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., and Gagliardi G.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei 34, Comprensorio A. Olivetti, I-80078 Pozzuoli, Italy

Istituto Italiano di Tecnologia, Via Morego 30, 16136 Genova, 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      Pages from: 043504  to: 043510

KeyWords: Angular momentum of light, Mie scattering, optical microcavities, whispering gallery modes resonators
DOI: 10.1103/PhysRevA.104.043504

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