Experimental studies of surface plasmon polariton band gap effect

V. S. Volkov, S. I. Bozhevolnyi, K. Leosson, Alexandra Boltasseva

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Surface plasmon polaritons (SPPs) propagation at a gold film surface covered by periodic arrays of ~40-nm-high scatterers arranged in a triangular lattice of different periods containing straight line defects is studied using collection scanning near-field optical microscopy. The results reveal the dependence of the SPP band gap (SPPBG) effect manifested via the SPP reflection and guiding (along line defects) on the parameters of the surface structures (period, filling factor and lattice orientation). We find that the SPPBG effect is stronger along &ggr;K direction for all investigated periodic structures. Our results demonstrate that the SPPBG effect becomes less pronounced with a decrease of the filling factor and disappears for a filling factor close to 0.2. We also observe that the centre of the SPPBG shifts towards longer wavelengths with an increase of the lattice period.
    Original languageEnglish
    JournalJournal of Microscopy
    Volume210
    Issue number3
    Pages (from-to)324-329
    ISSN0022-2720
    Publication statusPublished - 2003

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