Figure 1. Magnetic nanoparticle arrays and experimental configuration.

(a) Schematic of the system under study. For magnetic nanoparticle arrays, we show that, in the presence of magnetic material, the system response is governed not only by the induced dipole moment d_y parallel to the driving field E_y and the lattice period p_x (direction of dipole radiation), but also by the spin–orbit-induced and magnetic-field tunable dipole moment d_x and lattice period p_y. (b) Scanning electron micrograph of an ordered rectangular array of cylindrical Ni nanoparticles. Scale bar, 200 nm. (c) Angle- and wavelength-resolved optical transmission of a sample with p_x=p_y=400 nm and with particle diameter 120 nm, showing crossing of the <+1, 0> and <−1, 0> diffracted orders of the lattice at normal incidence.