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arXiv · 1305.0643

Momentum-space spectroscopy for advanced analysis of dielectric-loaded surface plasmon polariton coupled and bent waveguides

K. Hassan·A. Bouhelier·T. Bernardin·G. Colas-des-Francs·Jean-Claude Weeber·R. Espiau de Lamestre·Alain Dereux
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Abstract

We perform advanced radiation leakage microscopy of routing dielectric-loaded plasmonic waveguiding structures. By direct plane imaging and momentum-space spectroscopy, we analyze the energy transfer between coupled waveguides as a function of gap distance and reveal the momentum distribution of curved geometries. Specifically, we observed a clear degeneracy lift of the effective indices for strongly interacting waveguides in agreement with coupled-mode theory. We use momentum-space representations to discuss the effect of curvature on dielectric-loaded waveguides. The experimental images are successfully reproduced by a numerical and an analytical model of the mode propagating in a curved plasmonic waveguide.

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K. Hassan, A. Bouhelier, T. Bernardin, G. Colas-des-Francs, Jean-Claude Weeber, R. Espiau de Lamestre, Alain Dereux. 2013-05-03. Momentum-space spectroscopy for advanced analysis of dielectric-loaded surface plasmon polariton coupled and bent waveguides. https://doi.org/10.1103/physrevb.87.195428

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