Research Article

Elusive Pure Anapole Excitation in Homogenous Spherical Nanoparticles with Radial Anisotropy

Figure 2

(a) Scattered power spectra for an isotropic () dielectric () sphere of (inset). Besides the total scattered power (all, black curve), the contributions from current-integrated electric dipole (, red curve), toroidal dipole (, blue curve), and those from the far-field deduced electric dipole (, dashed magenta curve) and magnetic dipole (, dashed green curve) are shown. The shaded area is of interest and shown in detail in (b). Two points of different are indicated by black dots (A: , B: ). The corresponding near fields on the plane of are shown, respectively, in (A)-(B). The distributions for both the normalized (color-plots) and displacement field on the plane (vector-plots) are shown (the dashed black lines denote the boundaries of the particles), as is also the case for Figure 4.