Dispersion of resonant modes in patch antenna lattices
Journal article, Peer reviewed
Accepted version
Permanent lenke
https://hdl.handle.net/11250/2988728Utgivelsesdato
2022Metadata
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- Institutt for fysikk [2724]
- Publikasjoner fra CRIStin - NTNU [38628]
Originalversjon
https://doi.org/10.1364/OL.445776Sammendrag
Spectroscopic polar angle resolved Mueller matrix ellipsometry at multiple azimuthal incidences, together with a full-field model, reveal new details in the interplay between localized gap surface plasmon resonances and propagating surface plasmon polaritons (SPPs) in a rectangular array of metal–insulator–metal patches. A plane-wave expansion of the field in the insulator shows that the fundamental localized resonances are composed of oppositely propagating modes. Sharp dispersive resonances observed in p-polarization, excited near the opening of diffracted orders, are shown to be grating coupled SPPs. The SPPs show strong coupling with localized modes of similar symmetry, while they appear suppressed by modes of dissimilar symmetry.