Figure 1

Angular spectra of the linear reflectivity for excitation wavelengths of 660 nm (empty symbols) and 785 nm (full symbols). The incident light was polarized in the plane of incidence. Insets: (top) in-depth structure of the perforated sample and the reference frame; (middle) the antidots grid and the $k$ vectors of the excited plasmon (k${}^{SP}$, blue), light (k${}^{\hslash \omega }$, red), and the reciprocal lattice (G, black); (bottom left) an AFM image of a plasmonic sample, showing the hexagonal array of antidots.Reuse & Permissions

Figure 2

Anisotropic SHG response of the reference sample (empty dots), perforated sample far away (black diamonds), and right at (red dots) the plasmon resonance. The polarization configuration is $p$-in, $P$-out. The symmetry of the SHG intensity is inherited from the SPR excitation conditions resembling the symmetry of the hexagonal array of antidots.Reuse & Permissions

Figure 3

(a) Angular spectra of the SHG magnetic contrast for the reference (empty dots) and perforated (green full dots) films. The polarization configuration is $p$-in, $P$-out, the samples are magnetized in the transverse Kerr geometry, and the fundamental wavelength is 745 nm. Black diamonds represent the angular spectrum of the phase difference between even and odd in-magnetization SHG contributions. (b) Angular spectra of relative phases of the even (red empty dots) and odd (blue full dots) SHG components. The dashed area represents phase shift introduced by the SPR. Dotted lines are the result of an interpolation. The vertical line hints at the SP resonant angle at 745 nm wavelength.Reuse & Permissions