Gyromagnetically induced transparency of metasurfaces.
We demonstrate that the presence of a (gyro) magnetic substrate can produce an analog of electromagnetically induced transparency in Fano-resonant metamolecules. The simplest implementation of such gyromagnetically induced transparency (GIT) in a metasurface, comprised of an array of resonant antenna pairs placed on a gyromagnetic substrate and illuminated by a normally incident electromagnetic wave, is analyzed. Time reversal and spatial inversion symmetry breaking introduced by the dc magnetization makes metamolecules bianisotropic. This causes Fano interference between the otherwise uncoupled symmetric and antisymmetric resonances of the metamolecules giving rise to a sharp transmission peak through the otherwise reflective metasurface. We show that, for an oblique wave incidence, one-way GIT can be achieved by the combination of spatial dispersion and gyromagnetic effect. These theoretically predicted phenomena pave the way to nonreciprocal switches and isolators that can be dynamically controlled by electric currents.
Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA and Cockrell School of Engineering, University of Texas at Austin, Austin, Texas 78712, USA.
S Hossein
SH
Mousavi
Department of Physics, Queens College of The City University of New York, Queens, New York 11367, USA and The Graduate Center of The City University of New York, New York, New York 10016, USA.
Alexander B
AB
Khanikaev
Sensors Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA.
Jeffery
J
Allen
Sensors Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, USA.
Monica
M
Allen
Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA.
Gennady
G
Shvets