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arXiv · 1209.2808

Analysis of damping-induced phase flips of plasmonic nanowire modes

Andreas Hohenau·Primoz Kusar·Christian Gruber·Joachim R. Krenn
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Abstract

We launch surface plasmons from one end of a silver nanowire by asymmetric illumination with white light and use plasmon-to-light scattering at the nanowire ends to probe spectroscopically the plasmonic Fabry-Perot wire modes. The spectral positions of the maxima and minima in the scattered intensity from both nanowire ends are found to be either in phase or out-of phase, depending on the nanowire length and the spectral range. This behavior can be explained by a generalized Fabry-Perot model. The turnover-point between the two regimes is sensitive to the surface plasmon round trip losses and thus opens a new possibility for detecting changes of the optical absorption in the nanowire environment.

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Andreas Hohenau, Primoz Kusar, Christian Gruber, Joachim R. Krenn. 2012-09-13. Analysis of damping-induced phase flips of plasmonic nanowire modes. https://doi.org/10.1364/ol.37.000746

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