  Nonscattering optical anapole condition is corresponding to the excitation of
radiationless field distributions in open resonators, which offers new degrees
of freedom for tailoring light-matter interaction. Conventional mechanisms for
achieving such a condition relies on sophisticated manipulation of
electromagnetic multipolar moments of all orders to guarantee superpositions of
vanished moment strengths at the same wavelength. In contrast, here we report
on the excitation of optical radiationless anapole hidden in a resonant state
of a Si nanoparticle utilizing tightly focused radially polarized (RP) beam.
The coexistence of magnetic resonant state and anapole condition at the same
wavelength further enables the triggering of resonant state by tightly focused
azimuthally polarized (AP) beam whose corresponding electric multipole
coefficient could be zero. As a result, high contrast inter-transition between
radiationless anapole condition and ideal magnetic resonant scattering can be
achieved experimentally in visible spectrum. The proposed mechanism is general
which can be realized in different types of nanostructures. Our results
showcase that the unique combination of structured light and structured Mie
resonances could provide new degrees of freedom for tailoring light-matter
interaction, which might shed new light on functional meta-optics.
