Hybrid waveguide-surface plasmon polariton modes in a guided-mode resonance grating

We analyze the coupling between surface plasmon polaritons in a metal grating and the guided modes of a dielectric waveguide. Our model structure is a gold wire grating on a slab waveguide made of silicon nitride on silica wafer. The excitation of guided-mode resonances, surface plasmon polariton mo...

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Bibliographic Details
Published in:Optics communications 2012-10, Vol.285 (21-22), p.4381-4386
Main Authors: Tan, Chunlei, Simonen, Janne, Niemi, Tapio
Format: Article
Language:English
Subjects:
Computer simulation
Coupling
Degrees of freedom
Dielectric waveguide
Dielectric waveguides
Diffraction gratings
Gratings (spectra)
Guided mode resonance
Hybrid mode
Mathematical models
Plasmons
Polaritons
Surface plasmon polariton
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Summary:We analyze the coupling between surface plasmon polaritons in a metal grating and the guided modes of a dielectric waveguide. Our model structure is a gold wire grating on a slab waveguide made of silicon nitride on silica wafer. The excitation of guided-mode resonances, surface plasmon polariton modes and hybrid waveguide-plasmon modes are observed in numerical simulations. Our experiments verify the existence of the predicted modes. These hybrid modes add significant degrees of freedom in designing structures for plasmonic applications.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2012.07.027