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Schematics of polymer-loaded hybrid plasmonic waveguide, where multiple modes are launched by a grating in the silver film from an incident laser beam.
(a) Calculated mode effective index of polymer-loaded waveguide with respect to different polymer layer thickness including all TM and TE modes. (b) Mode profiles of TM3, TM4, and TE3 (achievable within the range of NA < 1.32 for h = 1 μm case) with the comparison with the TM0 (SPP) mode.
(a) LRM (NA = 1.32) detected mode propagation of the sample with h = 1 μm and coupling grating P = 550 nm (scale bar = 10 μm). (b) Field intensity data in mode propagations retrieved from the map (a). (c) Spatial Fourier spectrum of the field distribution, where a distinct peak is revealed with Λ = 2.52 μm−1.
LRM (NA = 1.32) detected mode interference with for different coupling grating samples: (a) P = 500 nm, (b) 540 nm, (c) 580 nm, and (d) 620 nm, where scale bar = 10 μm. (e) Fourier spectra of field distribution of these samples.
LRM detected mode propagations of (a) NA = 1.25 for sample h = 1 μm, (b) NA = 1.32, and (c) 1.25 for sample h = 560 nm (TM-polarized incidence), and the result of (d) a TE-polarized incidence with the same structural parameters of Fig. 3(a) (scale bar = 10 μm).
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