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(Color online) (a) Electron microscope image of a PMMA bigrating on gold film surface with approximately period. The grating consists of individual PMMA dots. (b) Illuminated by laser light, the area of the gold film above the grating exhibits the effect of extraordinary transmission and generates SPPs.
(Color online) (a) Parabola-shaped PMMA mirror with a rectangular bigrating area formed inside. The grey trapezoid near the focus point of the parabola is the theoretical image of the rectangular bigrating obtained using geometrical optics (ray tracing). (b) After the bigrating illumination with laser light, the field enhancement is observed between the apex and the focus of the parabola. (c) Optical energy propagation toward the apex may be visualized at the increased laser power due to Raleigh scattering of the SPP field in the PMMA film.
(Color online) (a) Linear dielectric waveguide is formed near the apex of the parabolic PMMA mirror. In (b) coupling and guiding of the optical energy down the end of the linear waveguide shown in (a) is demonstrated. (c) In a similar experiment, optical energy is coupled and guided down the curved dielectric waveguide. (d) AFM image of the curved waveguide formed at the apex of the parabolic mirror. The thin horizontal stripe of PMMA is used to scatter the SPPs that may propagate through the mirror boundary.
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