Excitation of radiationless anapole mode of isotropic dielectric   nanoparticles with tightly focused radially polarized beam
  A high index dielectric nano-sphere can be excited and yet remain radiationless. A method to excite the non-radiating anapole mode of a high index isotropic dielectric nanosphere is presented. With tightly focused radially polarized beam illumination, the main-contributing electric dipole mode and magnetic modes can be zero with only a weak electric quadruple contributing to the total scattering. Further, with a standing wave illumination formed by two counter-propagating focused radially polarized beam under $4\pi$ configuration, the ideal radiationless ananpole can be excited. 
Lei Wei, Zheng Xi, Nandini Bhattacharya, H. Paul Urbach
physics.optics