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Quality of spatial separation between electric and magnetic fields in anelectromagnetic wave is fundamentally constrained by nonlocal nature of Maxwellequations. While electric and magnetic energy densities in a wave, propagatingin vacuum, are equal at each point in space, carefully designed photonicstructures can enable surpassing this limit. Here, a set of high indexdielectric tubes was for the first time proposed and theoretically andexperimentally demonstrated to deliver a record high spatial separation,overcoming the free space scenario by more than three orders of magnitude withsimultaneous enhancement of the magnetic field. Separation effect in theproposed structure is enabled by the near-field interference on anapole-likestates, designed by tuning geometrical parameters of coupled dielectric tubes.The void layout of the structure enables the direct observation of the effectwith near-field probes and could be further employed for relevant applications.Novel devices, providing tunable high quality separation between electric andmagnetic fields, are extremely important for metrology, spectroscopy,spintronics, and opto-electronic applications.

Giant magneto-electric field separation via near-field interference on anapole-like states