(Color online) A schematic diagram of the fabrication of the nanoporous Au film.
(Color online) A schematic diagram of the near-field optical setup.
(Color online) (a) SEM image, (b) EDX spectrum, and (c) AFM image of the nanoporous Au film.
(Color online) The (a) transmission, (b) reflection, (c) absorption, and (d) scattering spectra of the nanoporous (solid lines) and the plain Au (dashed lines) films.
(Color online) (a) Topographic and (b) optical images of the plain Au film under horizontally polarized illumination. The scanned area is 2 × 2 μm2.
(Color online) (a, b) Topographic images of the nanoporous Au film in slightly different areas, and the corresponding optical images under (c) horizontal, and (d) perpendicular polarizations. Optical intensities along (e) the dotted line passing through “c” and (f) the dotted line through “d”. Note that marked circles in the images designate identical locations. The scanned area is 2 × 2 μm2.
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