All‐Dielectric Nanophotonics: The High‐Order Toroidal Moments and Anapole States in All‐Dielectric Photonics (Laser Photonics Rev. 13(5)/2019)

In article number 1800266, Egor A. Gurvitz and co‐workers reveal and investigate in detail the high‐order toroidal moments provided by particular "poloidal" current configurations. Therefore, the wire coiled around a torus surface (bottom left) depicts the currents inside a spherical nanoparticle corresponding to a toroidal electric dipole moment. The composition of these coils arranged on the torus surface (center) visualizes a toroidal magnetic moment. Utilizing these two basic configurations, higher‐order toroidal moments may be designed, such as toroidal quadrupoles, octupoles, etc.