Elusive Pure Anapole Excitation in Homogenous Spherical Nanoparticles with Radial Anisotropy

Figure 3

(a) Scattering spectra of radially anisotropic dielectric nanosphere (transverse permittivity is and ) showing only contributions from and . The lowest order minimum scattering points of and are pinpointed by circular dots and , respectively. (b) Spectral dependence of the minimum scattering points on is shown in (b) and is the overlapping point of and .

(a)

(b)