Amplitude Modulation of Anomalously Refracted Terahertz Waves with Gated-Graphene Metasurfaces

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Although recent progress in metasurfaces has shown great promise for applications, optical properties in metasurfaces are typically fixed by their structural geometry and dimensions. Here, an electrically controllable amplitude of anomalously-refracted waves in a hybrid graphene/metasurface system are experimentally demonstrated, which consists of an artificially constructed two-dimensional metallic apertures array and naturally occurring two-dimensional carbon atoms (graphene) in the subwavelength-scale (<lambda/10). Based on Pancharatnam-Berry phase and by careful design of a spatially linear phase profile, it is shown that the amplitude of anomalously refracted circularly cross-polarized terahertz waves can be effectively modulated by an applied gate voltage. The developed electrically tunable graphene metasurfaces may lead to various advanced applications that require dynamical control over electromagnetic waves, such as amplitude tunable active focusing lenses, vortex phase plates and dynamic holography.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2018-01
Language
English
Article Type
Article
Keywords

PHASE DISCONTINUITIES; PLASMONIC METASURFACES; BROAD-BAND; NEGATIVE REFRACTION; LIGHT-PROPAGATION; VISIBLE-LIGHT; METAMATERIALS; CLOAK; INDEX; TRANSMISSION

Citation

ADVANCED OPTICAL MATERIALS, v.6, no.1

ISSN
2195-1071
DOI
10.1002/adom.201700507
URI
http://hdl.handle.net/10203/239453
Appears in Collection
ME-Journal Papers(저널논문)
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