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The interaction between electromagnetic waves and objects is stronglyaffected by the shape and material composition of the latter. Artificiallycreated materials, formed by a subwavelength structuring of their unit cells,namely metamaterials, can exhibit peculiar responses to electromagneticradiation and provide additional powerful degrees of freedom to the scattererdesign. In particular, negative material susceptibilities give rise to strongresonant interactions with deeply subwavelength particles. While the negativeelectrical permittivity of natural noble metals manifests itself in localizedplasmon resonant oscillations, negative magnetic permeability is virtuallynon-existent in nature. Here the concept of artificial magnon resonance insubwavelength objects with effective negative permeability, designed based onthe metamaterial approach, is demonstrated. Strong localized oscillations ofthe magnetic fields within an array of split ring resonators, forming a sphere,hybridize in a collective mode of the structure. As a result, extremely highscattering cross section, exceeding that of a steel sphere with the same radiusby four orders of magnitude, was demonstrated. Furthermore, the scatteringcross section of subwavelength metamaterial-based sphere was shown to becomparable to the low frequency (MHz) radar signature of a big militaryaircraft. Super scatterers, based on tunable resonances within artificiallycreated materials, can find use in a broad range of electromagneticapplications, including wireless communications, radars, RFID, internet ofthings hardware and many others.

Super Scatterers Based on Artificial Localized Magnon Resonances