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Kerker superscattering
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DOI：10.1103/PhysRevApplied.23.014001.png)
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Abstract
En 中文
Electromagnetic multipoles play an important role in the rapid development of micro-optics and nano-optics and offer unique degrees of freedom for tailoring the electromagnetic scattering at the subwavelength scale. The electromagnetic Kerker effect refers to a phenomenon of unidirectional light scattering, arising from the interaction between the induced electric dipole and magnetic dipole moments within a scatterer. Notably, both moments are typically constrained by the single-channel scattering limit. Therefore, the total scattering cross section at the Kerker condition is also limited, imposing a challenge to achieve superscattering and unidirectional scattering on resonance simultaneously. Herein, we introduce a concept of Kerker superscattering based on the interaction between super electric dipole scattering and super magnetic dipole scattering where both of their scattering cross sections exceed the single-channel scattering limit. This Kerker superscattering is achieved by the use of a dielectric resonator coated with a metasurface. Analytical conditions are derived for the Kerker superscattering, which agrees well with full-wave simulations. Microwave experiments in the frequency and temporal domains are conducted to further consolidate the theoretical results. It is anticipated that the proposed concept could facilitate the development of subwavelength antennas, unidirectional couplers, and Huygens metasurfaces.
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