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O: Fachverband Oberflächenphysik
O 72: Plasmonics and Nanooptics VI
O 72.7: Talk
Thursday, March 25, 2010, 16:30–16:45, H32
Light guiding in para-hexaphenylene based nanofibers in interaction with a gold substrate studied by photoemission electron microcopy — •Till Leißner1, Michael Bauer1, Kasper Thilsing-Hansen2, Roana Melina de Oliveira Hansen2, Jakob Kjelstrup-Hansen2, and Horst-Günther Rubahn2 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel — 2NanoSYD, Mads Clausen Institute, University of Southern Denmark
Para-hexaphenylene (p-6P) based nanofibers have been proven to support almost loss-free and broadband optical wave guiding up to wavelengths as short as 400 nm [1]. As a dielectric distortion on top of a metallic substrate, they can, additionally, support the localized propagating of interface plasmon modes. P-6P nanofibers may therefore be useful as light-channeling sub-units and highly localized emitters in future ultrafast nanophotonic devices. To address the interaction between optical waveguiding and surface plasmon excitations we deposited well aligned p-6P nanofibers onto microstructured gold films. Photoemission Electron Microscopy was used to image the local light modes excited by a femtosecond laser pulse. Within the nanofibers, periodic beating patterns are observed which exhibit a strong dependence on the polarization the excitation laser field. The pattern periodicity can quantitatively be modeled and assigned to the interference between a propagating interface plasmon and the excitation light field, thus given evidence for plasmon guiding by the nanofibers.
[1] H.-G. Rubahn et al., Appl. Phys. Lett. 82, 10 (2003)