Multimode plasmon excitation and in situ analysis in top-down fabricated nanocircuits.
We experimentally demonstrate synthesis and in situ analysis of multimode plasmonic excitations in two-wire transmission lines supporting a symmetric and an antisymmetric eigenmode. To this end we irradiate an incoupling antenna with a diffraction-limited excitation spot exploiting a polarization- and position-dependent excitation efficiency. Modal analysis is performed by recording the far-field emission of two mode-specific spatially separated emission spots at the far end of the transmission line. To illustrate the power of the approach we selectively determine the group velocities of symmetric and antisymmetric contributions of a multimode ultrafast plasmon pulse.
NanoOptics and Biophotonics Group, Experimentelle Physik 5, Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
Peter
P
Geisler
Gary
G
Razinskas
Enno
E
Krauss
Xiao-Fei
XF
Wu
Christian
C
Rewitz
Philip
P
Tuchscherer
Sebastian
S
Goetz
Chen-Bin
CB
Huang
Tobias
T
Brixner
Bert
B
Hecht
D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods*; D020349:Surface Plasmon Resonance