Abstract
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.
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Acknowledgements
This work was funded by the German Research Foundation (DFG) through the Collaborative Research Center 677 “Function by Switching.”
Jacek Fiutowski, Jost Adam, and Till Leißner thank the Fabrikant Mads Clausen’s Foundation for a research grant supporting this work.
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Großmann, M., Thomaschewski, M., Klick, A. et al. Single-Mode to Multi-Mode Crossover in Thin-Load Polymethyl Methacrylate Plasmonic Waveguides. Plasmonics 13, 1441–1448 (2018). https://doi.org/10.1007/s11468-017-0649-3
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DOI: https://doi.org/10.1007/s11468-017-0649-3