(a)

(b)

(c)

Figure 3: (a) Spectral response of an array of slits on the gold layer (w = 200 nm, p = 600 nm, l = 550 nm) placed over a silica substrate ( = 1.45). Profile of the absolute value of the magnetic field computed at (b) λ = 626.5 nm and (c) λ = 901.5 nm; red arrows express the direction of the Poynting vector.