Artificial Nonlinearity Generated from Electromagnetic Coupling Meta-molecule

Abstract

A purely artificial mechanism for optical nonlinearity is proposed based on a metamaterial route. The mechanism is derived from classical electromagnetic interaction in a meta-molecule consisting of a cut-wire meta-atom nested within a split-ring meta-atom. Induced by the localized magnetic field in the split-ring meta-atom, the magnetic force drives an anharmonic oscillation of free electrons in the cut-wire meta-atom, generating an intrinsically nonlinear electromagnetic response. An explicit physical process of a second-order nonlinear behavior is adequately described, which is perfectly demonstrated with a series of numerical simulations. Instead of "borrowing" from natural nonlinear materials, this novel mechanism of optical nonlinearity is artificially dominated by the meta-molecule geometry and possesses unprecedented design freedom, offering fascinating possibilities to the research and application of nonlinear optics.

arXiv comment13 pages + 10 pages supplement, published in Physical Review Letters

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Cited by in corpus (2)

• Frequency mixing at an electromagnetically induced transparency like metasurface loaded with gas as a nonlinear element
• Low-power threshold gas discharge by enhanced local electric field in electromagnetically-induced-transparencylike metamolecules