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(Color online) (a) Sketch of the attenuated total reflection setup, LS: tunable light source (Koheras), PD: Photo diode (b) sample structure: glass substrate (light blue), silver layer (gray), PMMA layer (dotted green) doped with different concentrations of Rhodamine800.
(Color online) (a) Reflectivity signal measured vs wavelength (blue thick line) at different angles of incidence for sample C H . The curves resulting from the analytical transfer matrix method model described in the text (red thin line) have been superimposed for comparison. (b) R800 absorption spectrum (orange solid line). To better visualize the SPP-dye interaction, the absorption peaks position has been marked (vertical orange dashed lines). The black dotted line plots the imaginary part of two Lorentzians with parameters retrieved from transfer matrix fits of sample C H (cf., Table I). Both curves are normalized to their maximum value.
(Color online) (a) and (b) (Red dots) Dispersion relations for sample C H and sample C L retrieved from the multiple minima in the spectra reflectivity vs wavelength. (Blue line) Calculated dispersion relation for the same sample without dye in the PMMA layer. (Green lines) Coupled oscillators fit for the dye-SPP interaction. (c) Mixing coefficients for the middle branch between E 1 and E 2 retrieved from the coupled-oscillators fit on sample C H . Solid line: B1 , dotted line: B2 , dashed line: B3.
Sample parameters retrieved from experimental data with the TMM model and the QMO model.
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