Journal
OPTICS LETTERS
Volume 44, Issue 24, Pages 6041-6044Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.006041
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Funding
- National Research Foundation Singapore [CRP-R263000C24281, ISF-R263000C64281]
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We report on an anomalous plasmon hybridization in sideby-side coupled metallic nanoantennas on top of a silicon waveguide. Contrary to the conventional perception based on Coulomb coupling, the hybridized anti-symmetric mode in our structure possesses a higher resonance frequency than the symmetric mode. This unusual phenomenon reveals a new mechanism of plasmon hybridization, namely, coupling-induced charge redistribution. Our work includes numerical simulation, experimental validation, and theoretical analysis, emphasizing the importance of dielectric interfaces in coupled plasmonic structures, and offers new possibilities for non-Hermitian systems and integrated devices. (C) 2019 Optical Society of America
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