PositiveNegative Birefringence in Multiferroic Layered Metasurfaces
Abstract
We uncover and identify the regime for a magnetically and ferroelectrically controllable negative refraction of light traversing multiferroic, oxidebased metastructure consisting of alternating nanoscopic ferroelectric (SrTiO$_2$) and ferromagnetic (Y$_3$Fe$_2$(FeO$_4$)$_3$, YIG) layers. We perform analytical and numerical simulations based on discretized, coupled equations for the selfconsistent Maxwell/ferroelectric/ferromagnetic dynamics and obtain a biquadratic relation for the refractive index. Various scenarios of ordinary and negative refraction in different frequency ranges are analyzed and quantified by simple analytical formula that are confirmed by fullfledge numerical simulations. Electromagneticwaves injected at the edges of the sample are propagated exactly numerically. We discovered that for particular GHz frequencies, waves with different polarizations are characterized by different signs of the refractive index giving rise to novel types of phenomena such as a positivenegative birefringence effect, and magnetically controlled light trapping and accelerations.
 Publication:

Nano Letters
 Pub Date:
 November 2016
 DOI:
 10.1021/acs.nanolett.6b03936
 arXiv:
 arXiv:1710.05995
 Bibcode:
 2016NanoL..16.7290K
 Keywords:

 Physics  Optics;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 Nano Letters, v.16, 7290 (2016)