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Active control and switching of broadband electromagnetically induced transparency in symmetric metadevices
R. Yahiaoui, M. Manjappa, , R. Singh
Published in American Institute of Physics Inc.
2017
Volume: 111
   
Issue: 2
Abstract
Electromagnetically induced transparency (EIT) arises from coupling between the bright and dark mode resonances that typically involve subwavelength structures with broken symmetry, which results in an extremely sharp transparency band. Here, we demonstrate a tunable broadband EIT effect in a symmetry preserved metamaterial structure at the terahertz frequencies. Alongside, we also envisage a photo-active EIT effect in a hybrid metal-semiconductor metamaterial, where the transparency window can be dynamically switched by shining near-infrared light beam. A robust coupled oscillator model explains the coupling mechanism in the proposed design, which shows a good agreement with the observed results on tunable broadband transparency effect. Such active, switchable, and broadband metadevices could have applications in delay bandwidth management, terahertz filtering, and slow light effects. © 2017 Author(s).
About the journal
JournalApplied Physics Letters
PublisherAmerican Institute of Physics Inc.
ISSN00036951