Near-Field Analysis of Bright and Dark Modes on Plasmonic Metasurfaces Showing Extraordinary Suppressed Transmission
arXiv:1407.5045 · doi:10.1002/adom.201400237
Abstract
Plasmonic metasurfaces are investigated that consist of a sub wavelength line pattern in an ultrathin (~ 10 nm) silver film, designed for extraordinarily suppressed transmission (EOST) in the visible spectral range. Measurements with a near-field scanning optical microscope (NSOM) demonstrate that far field irradiation creates resonant excitations of antenna like (bright) modes that are localized on the metal ridges. In contrast, bound (dark) surface plasmon polaritons (SPPs) launched from an NSOM tip propagate well across the metasurface, preferentially perpendicular to the grating lines.
arXiv comment27 pages, 8 figures and supplementary. This is the pre-peer reviewed version of the following article: S. Dobmann, A. Kriesch, D. Ploss, and U. Peschel, Advanced Optical Materials, 10.1002/adom.201400237 (2014), which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/adom.201400237/abstract
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