Near-field excitation and near-field detection of propagating surface plasmon polaritons on Au waveguide structures

Dallapiccola, R.; Dubois, C.; Gopinath, A.; Stellacci, F.; Dal Negro, L.
June 2009
Applied Physics Letters;6/15/2009, Vol. 94 Issue 24, p243118
Academic Journal
The propagation of surface plasmon polaritons guided along Au metal waveguides fabricated by electron-beam lithography is experimentally investigated using simultaneous near-field excitation and detection of plasmon-polariton modes localized at the air/Au interface. The directly measured propagation characteristics of surface plasmon-polaritons agree well with simulation results obtained using full-vector calculations and the analytic dispersion of asymmetric plasmonic waveguides for thin Au films. Our results demonstrate that near-field excitation/detection schemes are well suited for direct imaging and characterization of propagating surface plasmon-fields bound to thin-film metal layers, and can be used for fast and reliable characterization of plasmonic waveguide elements and nanodevices.


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