Sharp Toroidal Resonances in Planar Terahertz Metasurfaces.

Abstract

A toroidal dipole in metasurfaces provides an alternate approach for the excitation of high-Q resonances. In contrast to conventional multipoles, the toroidal dipole interaction strength depends on the time derivative of the surrounding electric field. A characteristic feature of toroidal dipoles is tightly confined loops of oscillating magnetic field that… (More)
DOI: 10.1002/adma.201601611

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