Figure 4From: Photo-induced electric polarizability of Fe3O4 nanoparticles in weak optical fieldsz-Scan results for the MMAS. (a) Curves for z-scans with open (circle) T(I) and closed (square) Tpv(I) apertures at radiation wavelengths of 442 nm (red points, 60 W/cm2) and 561 nm (blue points, 133 W/cm2) for the MMAS sample (L = 2.7 mm). (b) Profilometer images for the beam waists ω0.Back to article page