Fig. 2.

Analysis of the optical response of an individual nanostructure. (A) High-angle scanning electron microscope (HA-SEM) image of nanostructures on the daguerreotype surface. (Scale bar, $200$ nm.) (B) Schematic diagram of the simulation geometry. (C) Calculated scattering spectra for a nanostructure with $h=98$ nm and $d=116$ nm. The blue and red curves show, respectively, the results for illumination with S or P polarization (B), while the black curve corresponds to averaged results. (D–G) Induced charge (D and F) and radiation pattern (E and G) for the horizontal and vertical dipole modes, calculated at $365$ nm and $670$ nm, respectively.