Ultradirectional scattering of radially anisotropic nanoparticles

We demonstrate that radial anisotropy can be employed to tune effectively the spectral positions of electric resonances of nanoparticles, which enables flexible overlapping of electric and magnetic dipoles of various numbers and thus leads to unidirectional forward superscattering. We further reveal that through adjusting the radial anisotropy parameters, electric and magnetic resonances of higher orders can be also made overlapped, thus further collimating the forward scattering lobes.