期刊
PHYSICAL REVIEW A
卷 104, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.104.043504
关键词
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资金
- European Union's Horizon 2020 research and innovation programme under the Marie SklodowskaCurie Grant [795838]
- Italian Ministry for University Research (MUR) [20177PSCKT]
- Marie Curie Actions (MSCA) [795838] Funding Source: Marie Curie Actions (MSCA)
This study investigates the resonance spectrum and scattered light field of whispering-gallery modes (WGMs) in a liquid droplet excited with a free-space visible laser beam based on the generalized Lorenz-Mie theory. By imaging the scattering patterns, a strong agreement between theory and experiment is shown. The research provides insights into the free-space optical coupling phenomenon and offers pathways for controlled excitation of ultrahigh-quality WGMs in a variety of optical microresonators for sensing and imaging applications.
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.
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