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We experimentally demonstrate synthesis and in-situ analysis of multimodeplasmonic excitations in two-wire transmission lines supporting a symmetric andan antisymmetric eigenmode. To this end we irradiate an incoupling antenna witha diffraction-limited excitation spot exploiting a polarization- andposition-dependent excitation efficiency. Modal analysis is performed byrecording the far-field emission of two mode-specific spatially separatedemission spots at the far end of the transmission line. To illustrate the powerof the approach we selectively determine the group velocities of symmetric andantisymmetric contributions of a multimode ultrafast plasmon pulse.

Multimode plasmon excitation and in-situ analysis in top-down fabricated plasmonic nanocircuits