Active control and switching of broadband electromagnetically induced transparency in symmetric metadevices

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 symmet...

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Bibliographic Details
Published inApplied physics letters Vol. 111; no. 2
Main Authors Yahiaoui, Riad, Manjappa, Manukumara, Srivastava, Yogesh Kumar, Singh, Ranjan
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 10.07.2017
Subjects
Active control
Applied physics
Bandwidths
Broadband
Broken symmetry
Coupling
Filtration
Infrared radiation
Light beams
Metamaterials
Symmetry
Terahertz frequencies
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Summary: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.
Bibliography:ObjectType-Article-1
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ISSN:0003-6951
1077-3118
DOI:10.1063/1.4993428