Journal
APPLIED OPTICS
Volume 61, Issue 33, Pages 9788-9794Publisher
Optica Publishing Group
DOI: 10.1364/AO.472096
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Funding
- National Natural Science Foundation of China
- [61735010]
- [92150101]
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This paper investigates the intrinsic link between surface plasmon modes and lattice modes in subwavelength periodic structures using the split-ring metamaterial structure. The study demonstrates that strong coupling between the eigenmodes and lattice modes can be achieved by adjusting the meta-material structure's period. This coupling leads to the emergence of new modes at low frequencies, reducing spectral loss and increasing the Q factor.
The intrinsic link between surface plasmon modes (eigenmodes) and lattice modes in subwavelength periodic structures is investigated based on the split-ring metamaterial structure. The paper shows that the strong coupling between the eigenmodes and the lattice modes can be achieved by appropriately adjusting the period of the meta -material structure, and the emergence of new, to the best of our knowledge, modes at low frequencies is observed, resulting in a lower spectral loss of a single hybrid resonance and an increase in its Q factor up to 110. In addition, an asymmetric double-split-ring structure is proposed, and the Fano resonance is excited, giving rise to a spec-tral line with three resonance valleys. The coupled harmonic-oscillator model is used to interpret the underlying coupling mechanism in lattice-induced transparent systems, which agrees well with our simulation results. This strong-coupling scheme between the lattice and the mixed modes of the metamaterial unit provides a new avenue to modulate lattice-induced transparency, high-Q resonance, and strong-field confinement, which may find appli-cations in the design of ultrasensitive sensors, slow-light devices, as well as multiple frequency absorbers and other fields. (c) 2022 Optica Publishing Group
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