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Nonscattering optical anapole condition is corresponding to the excitation ofradiationless field distributions in open resonators, which offers new degreesof freedom for tailoring light-matter interaction. Conventional mechanisms forachieving such a condition relies on sophisticated manipulation ofelectromagnetic multipolar moments of all orders to guarantee superpositions ofvanished moment strengths at the same wavelength. In contrast, here we reporton the excitation of optical radiationless anapole hidden in a resonant stateof a Si nanoparticle utilizing tightly focused radially polarized (RP) beam.The coexistence of magnetic resonant state and anapole condition at the samewavelength further enables the triggering of resonant state by tightly focusedazimuthally polarized (AP) beam whose corresponding electric multipolecoefficient could be zero. As a result, high contrast inter-transition betweenradiationless anapole condition and ideal magnetic resonant scattering can beachieved experimentally in visible spectrum. The proposed mechanism is generalwhich can be realized in different types of nanostructures. Our resultsshowcase that the unique combination of structured light and structured Mieresonances could provide new degrees of freedom for tailoring light-matterinteraction, which might shed new light on functional meta-optics.

Cylindrical vector beams reveal radiationless anapole condition in a resonant state