Multiple Fano-Like Transmission Mediated by Multimode Interferences in Spoof Surface Plasmon Cavity-Waveguide Coupling System


Many efforts are dedicated to the look of photonic microcavities and the use of them in optical sensing, imaging, optomechanics, lasing, and micromanipulation. Cavities supporting spectrally close multiple resonance modes will favor energy exchange among the modes and therefore the ambient, enabling nontrivial coherent dynamics that are helpful in wave manipulation. Coupling between multimode cavities with multiple waveguides is a significant theme for optical, terahertz, and microwave signal control, however remains largely unexplored. Here we have a tendency to gift a phenomenological modeling primarily based on the coupled mode theory (CMT) that totally accounts for the interplays between such a cavity and surrounding waveguide structures in a generic state of affairs with uneven coupling rates between the guiding channels and therefore the resonant modes. It's shown that the waveguide-cavity couplings are crucial for the energy steering between the modes and their way-field radiation and provide flexible control over waveguide transmission featured with a multiple Fano line profile. Numerical simulations were conducted for a spoof plasmonic cavity waveguides system working at sub-GHz band to demonstrate these effects. The results are in smart agreement with the CMT prediction.

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