Figure 3

Near-field distribution of the square of electric field intensity for different dielectric particles including the small particles with the radius R=1.8 nm and different reflective indices (a) n=1.33, (b) n=2.5 and (c) n=4 (scattering light λ=496 nm) and with the reflective indices n=1.33 and (d) different radii R=50 nm, (e) R=500 nm and (f) R=1000 nm (scattering light λ=500 nm). In a–f, E _max²=1.90E₀², 5.15E₀², 7.10E₀², 2.20E₀², 16.0E₀² and 38.0E₀², respectively.