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

R. Dallapiccola, C. Dubois, A. Gopinath, F. Stellacci, L. Dal Negro

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number243118
JournalApplied Physics Letters
Volume94
Issue number24
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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