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Anapole states associated with the resonant suppression of electric-dipolescattering exhibit minimized extinction and maximized storage ofelectromagnetic energy inside a particle. Using numerical simulations, opticalextinction spectroscopy and amplitude-phase near-field mapping of silicondielectric disks, we demonstrate high-order anapole states in the near-infraredwavelength range (900-1700 nm). We develop the procedure for unambiguouslyidentifying anapole states by monitoring the normal component of the electricnear-field and experimentally detect the first two anapole states as verifiedby far-field extinction spectroscopy and confirmed with the numericalsimulations. We demonstrate that higher order anapole states possess strongerenergy concentration and narrower resonances, a remarkable feature that isadvantageous for their applications in metasurfaces and nanophotonicscomponents, such as non-linear higher-harmonic generators and nanoscale lasers.

Direct amplitude-phase near-field observation of higher-order anapole states