Scattering and near fields of a dielectric nanoparticle. (a) Scattering cross section of a 170-nm radius nanoparticle with refractive index n = 2 and k = 0; sum and allocation to different order and electromagnetic (E/M) modes. (b) Near field distribution of the electromagnetic field around the nanoparticle for the dipole, the quadrupole, the hexapole, and the octopole magnetic mode at wavelengths of 700, 502, 392, and 322 nm, respectively, which correspond to the maxima in scattering (incident light from the top).
Schmid et al. Nanoscale Research Letters 2014 9:50 doi:10.1186/1556-276X-9-50