Fig. 9

Color maps of the distribution of the magnetic field H_y calculated using the RCWA method. The color bar shows the magnitude of the magnetic field of a Ag at λ = 450 nm, b Al at λ = 450 nm, c Ag at λ = 375 nm, and d Al at λ = 375 nm. The details of the structural parameters are given in Table 1. Red arrows indicate where the magnetic field concentrates on the interface between air and metal