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Proceedings Paper

Gyromagnetically induced transparency of metasurfaces (Presentation Recording)
Author(s): Gennady B. Shvets; Hossein Mousavi; Alexander Khanikaev; Jeffery W. Allen; Monica Allen
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Paper Abstract

The concept of symmetry pervades modern physics. Through the conservation laws derived from various symmetries, high-level restrictions and selection rules can be derived for a variety of physical systems without any need for detailed investigations of their specific properties. The spatial symmetries of electric charge distribution on the metamaterial’s surface determine whether the EM resonance is “bright” (radiatively coupled to) or “dark” (radiatively de-coupled from) the EM continuum. As we demonstrate in this talk, other (non-spatial) symmetries and their breaking can also be crucial to determine the properties of EM resonances and enable their mutual coupling, which in turn can give rise to EM Fano interferences. I will consider a meta-surface formed by a two-dimensional array of double-antenna meta-molecules resting on a gyromagnetic ferrite substrate. In conclusion, I will use simple symmetry considerations to predict and numerically demonstrate two phenomena that occur in meta-surfaces when symmetry of the system is reduced by a gyromagnetic substrate: gyromagnetically induced transparency and nonreciprocal Fano interference. These phenomena hold significant promise for practical applications such as the dynamic control of resonant EM interactions using magnetic fields produced by the external currents, mitigation of co-site interference and improving isolation. Spectral positions, radiative lifetimes and quality factors of Fano resonances can be controlled by the magnitude of the external magnetic field. This class of effects may lead to a new generation of tunable and nonreciprocal Fano resonant systems for various applications where strong field enhancement, tunability and nonreciprocity are simultaneously required.

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9546, Active Photonic Materials VII, 95461F (5 October 2015); doi: 10.1117/12.2189726
Show Author Affiliations
Gennady B. Shvets, The Univ. of Texas at Austin (United States)
Hossein Mousavi, The Univ. of Texas at Austin (United States)
Alexander Khanikaev, Queens College (United States)
Jeffery W. Allen, Air Force Research Lab. (United States)
Monica Allen, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 9546:
Active Photonic Materials VII
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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