Nondispersive optical activity of meshed helical metamaterials

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Extreme optical properties can be realized by the strong resonant response of metamaterials consisting of subwavelength-scale metallic resonators. However, highly dispersive optical properties resulting from strong resonances have impeded the broadband operation required for frequency-independent optical components or devices. Here we demonstrate that strong, flat broadband optical activity with high transparency can be obtained with meshed helical metamaterials in which metallic helical structures are networked and arranged to have fourfold rotational symmetry around the propagation axis. This nondispersive optical activity originates from the Drude-like response as well as the fourfold rotational symmetry of the meshed helical metamaterials. The theoretical concept is validated in a microwave experiment in which flat broadband optical activity with a designed magnitude of 45 degrees per layer of metamaterial is measured. The broadband capabilities of chiral metamaterials may provide opportunities in the design of various broadband optical systems and applications.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2014-11
Language
English
Article Type
Article
Keywords

NEGATIVE REFRACTIVE-INDEX; CIRCULAR POLARIZERS; PHOTONIC METAMATERIALS; CHIRAL METAMATERIALS; TRANSMISSION; DEPOSITION; RESONANCE; ROTATOR

Citation

NATURE COMMUNICATIONS, v.5

ISSN
2041-1723
DOI
10.1038/ncomms6435
URI
http://hdl.handle.net/10203/201076
Appears in Collection
ME-Journal Papers(저널논문)
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