Nontrivial invisibility induced by optical hybrid anapole

Abstract

The novel hybrid anapole states supported by dielectric nanoparticles are associated with the condition whem all the dominant Cartesian multipoles interfere destructively with their corresponding toroidal counterparts. They are characterized by a negligible light scattering for any observation direction. In the current work, we have proven the existence of high order hybrid anapole states in the visible range, resulting in a drastic reduction of the scattered radiation from a cylindrical nanoparticle with dimensions comparable to the wavelength. We demonstrate it by expanding the numerically calculated scattering cross section of the nanoparticle in terms of the Cartesian multipole decomposition. The simulations illustrate the simultaneous resonant suppression of the four leading multipole contributions to radiation (e.g. electric and magnetic dipoles and quadrupoles). Our results confirm the possibility to observe the effect experimentally, paving the way for future applications in dielectric nanophotonics.