Open AccessEffective negative refractive index in ferromagnet-semiconductor superlattices
Author(s) -
Roland H. Tarkanyan,
D. Niarchos
Publication year - 2006
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.005433
Subject(s) - poynting vector , negative refraction , refractive index , polariton , condensed matter physics , superlattice , permittivity , physics , optics , electromagnetic radiation , magnetic field , metamaterial , ferromagnetism , wave vector , dielectric , optoelectronics , quantum mechanics
Problem of anomalous refraction of electromagnetic waves is analyzed in a superlattice which consists of alternating layers of ferromagnetic insulator and nonmagnetic semiconductor. Effective permittivity and permeability tensors are derived in the presence of an external magnetic field parallel to the plane of the layers. It is shown that in the case of the Voigt configuration, the structure behaves as a left-handed medium with respect to TE-type polarized wave, in the low-frequency region of propagation. The relative orientation of the Poynting vector and the refractive wave vector is examined in different frequency ranges. It is shown that the frequency region of existence for the backward mode can be changed using external magnetic field as tuning parameter.