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

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5 Author(s)
Dallapiccola, R. ; Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA ; Dubois, C. ; Gopinath, A. ; Stellacci, F.
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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.

Published in:

Applied Physics Letters  (Volume:94 ,  Issue: 24 )

Date of Publication:

Jun 2009

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