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Physics > Optics

arXiv:1605.09163 (physics)
[Submitted on 30 May 2016]

Title:Sign-Reversal Coupling in Coupled-Resonator Optical Waveguide

Authors:Zhen Gao, Fei Gao, Youming Zhang, Baile Zhang
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Abstract:Coupled-resonator optical waveguides (CROWs), which play a significant role in modern photonics, achieve waveguiding through near-field coupling between tightly localized resonators. The coupling factor, a critical parameter in CROW theory, determines the coupling strength between two resonators and the waveguiding dispersion of a CROW. However, the original CROW theory proposed by Yariv et al. only demonstrated one value of coupling factor for a multipole resonance mode. Here, by imaging the tight-binding Bloch waves on a CROW consisting of designer-surface-plasmon resonators in the microwave regime, we demonstrate that the coupling factor in the CROW theory can reverse its sign for a multipole resonance mode. This determines two different waveguiding dispersion curves in the same frequency range, experimentally confirmed by matching Bloch wavevectors and frequencies in the CROW. Our study supplements and extends the original CROW theory, and may find novel use in functional photonic systems.
Subjects: Optics (physics.optics)
Cite as: arXiv:1605.09163 [physics.optics]
  (or arXiv:1605.09163v1 [physics.optics] for this version)
  https://doi.org/10.48550/arXiv.1605.09163

Submission history

From: Zhen Gao [view email]
[v1] Mon, 30 May 2016 10:21:57 UTC (1,614 KB)
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