Single-mode to multi-mode crossover in thin-load polymethyl methacrylate plasmonic waveguides

Malte Großmann, Martin Thomaschewski, Alwin Klick, Arkadiusz Jaroslaw Goszczak, Elżbieta Karolina Sobolewska, Till Leißner, Jost Adam, Jacek Fiutowski, Horst-Günter Rubahn, Michael Bauer

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Mode character and mode dispersion of sub-60-nm-thick polymethyl methacrylate dielectric-loaded surface plasmon-polariton waveguides (DLSPPWs) are investigated using photoemission electron microscopy and finite element method simulations. Experiment and simulation show excellent agreement and allow identifying a crossover from single-mode to multi-mode waveguiding as a function of excitation wavelength λ and DLSSPW cross section. Experiment and simulations yield, furthermore, indications for the formation of a surface plasmon-polariton cavity mode in the close vicinity of the waveguides.
Original languageEnglish
Issue number4
Pages (from-to)1441-1448
Publication statusPublished - 2018


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