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Coupling-Strength-Dependent Phase Differences between Two Coupled Modes in Plasmonic Nanostructures
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DOI：10.1021/acs.jpcc.4c07996.png)
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Here, we theoretically investigate the phase difference between two coupled modes through near-field interactions in nanophotonic structures, especially plasmonic ones. Both simulations and the analytical coupled oscillator model demonstrate that the phase difference at the antibonding hybridization position could be far from pi and is highly dependent on many system parameters, especially the mode coupling strength and the response strengths of interacting modes. Even under efficient coupling conditions, the phase difference at the antibonding position can still be as small as approximately 0.5 pi or even less. Such a phase difference is far from a typical feature of antibonding hybridization. The influences from other parameters, such as resonance position, line width difference, and structure configurations, are also considered here. A practical composite system consisting of a dielectric cavity with a high-quality (Q) resonance and a plasmonic structure is investigated. Owing to the weak couplings in such systems, the phase difference near the high-Q mode remains constant across wavelengths. At the same time, it is closely related to the spectral detuning between the two interacting modes. Our results are essential for a basic understanding of interacting modes in nanophotonic systems and the corresponding applications involving those systems.
Keyword:
FANO RESONANCES
GOLD NANORODS
NANOANTENNAS
期刊
IF:
3.2
论文数:
5.6W
被引数:
15.0W
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