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SPP generation and propagation in (a) a conventional Kretschmann-Raether ATR setup and (b) the R-SPP system. Incident light within medium 2 is directed towards the metal film and directly reflected light are indicated with dark and light shading, respectively. Radiation loss and reprocessing of radiation into SPPs are indicated by arrows in the propagation (right) sections in (a) and (b), respectively.
(Color online) FDTD electric field intensities at a time after steady state has been achieved for (a) conventional ATR and (b) R-SPP systems. For clarity, only the portions of the full solutions are displayed. In each case, the metal thickness and the top metal surface is at , where intense SPPs are visible. In (b), the dielectric layer below the metal in the propagation region has thickness . Intensities are represented with white. This cutoff allows one to see direct reflection and radiation losses which can be less intense than the SPPs.
Metal thickness, , dependence of (a) SPP propagation lengths and (b) SPP intensities at and above the metal surface. The dashed–dotted line in (a) is the semi-infinite metal case .
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