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Localized and propagating surface plasmon resonances are known to show verypronounced interactions if they are simultaneously excited in the samenanostructure. Here we study the fano interference that occurs betweenlocalized (LSPR) and propagating (SPP) modes by means of phase sensitivespectroscopic ellipsometry. The sample structures consist of periodic gratingsof gold nanodisks on top of a continuous gold layer and a thin dielectricspacer, in which the structural dimensions were tuned in such a way that thedipolar LSPR mode and the propagating SPP modes are excited in the samespectral region. We observe pronounced anti-crossing and strongly asymmetricline shapes when both modes move to each others vicinity, accompagnied oflargely increased phase differences between the respective plasmon resonances.Moreover we show that the anti-crossing can be exploited to increase therefractive index sensitivity of the localized modes dramatically, which resultin largely increased values for the Figure-Of-Merit which reaches valuesbetween 24 and 58 for the respective plasmon modes.

Tuning the Fano resonance between localized and propagating surface plasmon resonances for refractive index sensing applications