Metal-coated magnetic nanoparticles in an optically active medium: A nonreciprocal metamaterial

Aristi Christofi and Nikolaos Stefanou
Phys. Rev. B 97, 125129 – Published 16 March 2018

Abstract

We report on the optical response of a nonreciprocal bianisotropic metamaterial, consisting of spherical, metal-coated magnetic nanoparticles embedded in an optically active medium, thus combining gyrotropy, plasmonic resonances, and chirality in a versatile design. The corresponding effective medium is deduced by an appropriate two-step generalized Maxwell-Garnett homogenization scheme. The associated photonic band structure and transmission spectra are obtained through a six-vector formulation of Maxwell equations, which provides an efficient framework for general bianisotropic structures going beyond existing approaches that involve cumbersome nonlinear eigenvalue problems. Our results, analyzed and discussed in the light of group theory, provide evidence that the proposed metamaterial exhibits some remarkable frequency-tunable properties, such as strong, plasmon-enhanced nonreciprocal polarization azimuth rotation and magnetochiral dichroism.

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  • Received 7 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.125129

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Aristi Christofi* and Nikolaos Stefanou

  • Department of Solid State Physics, National and Kapodistrian University of Athens, Panepistimioupolis, GR-157 84 Athens, Greece

  • *aristi.christofi@gmail.com

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Issue

Vol. 97, Iss. 12 — 15 March 2018

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