Abstract

We review the fundamental aspects and applications of functional magneto-optic and opto-magnetic metamaterials displaying collective and coupling effects on the nanoscale, where the concepts of optics and magnetism merge to produce unconventional phenomena. The use of magnetic materials instead of the usual noble metals allows for an additional degree of freedom for the control of electromagnetic field properties as well as allowing light to interact with the spins of the electrons and to actively manipulate the magnetic properties of such nanomaterials. In this context, we explore the concepts of near-field coupling of plasmon modes in magnetic metamolecules as well as the effect of excitation of surface lattice resonances in magneto-plasmonic crystals. Moreover, we discuss how these coupling effects can be exploited to artificially enhance optical magnetism in plasmonic metamolecules and crystals. Finally, we highlight some of the present challenges and provide a perspective on future directions of the research toward photon-driven fast and efficient nanotechnologies bridging magnetism and optics beyond current limits.

© 2019 Optical Society of America

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