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While long-range propagating plasmons have been extensively investigated forimplementing on-chip optical sensing platforms, waveguide-excited localizedsurface plasmon resonance (LSPR) based sensing systems have not yet receivedmuch attention. Waveguide excitation and readout as an alternative tofree-space light based single-particle spectroscopy are particularly attractivefor high-throughput sensing and on-chip drug discovery platforms. Here wepresent a numerical investigation of the optical response of awaveguide-excited plasmonic dolmen-shaped compound nanoantenna that exhibits aFano signature in its spectral response. Although only evanescently coupled tothe waveguide, the compound nanoantenna is seen to induce a high-contrastextinction in the transmission spectrum of the waveguide. The compoundplasmonic nanoantenna configuration presented here is of interest in hybridphotonic-plasmonic sensing approaches with high-throughput capabilities.

The Fano Signature in the Optical Response of a Waveguide-excited Compound Plasmonic Nanoantenna