Demonstration of a Three-dimensional Negative Index Medium Operated at Multiple-angle Incidences by Monolithic Metallic Hemispherical Shells

We design and construct a three-dimensional (3D) negative index medium (NIM) composed of gold hemispherical shells to supplant an integration of a split-ring resonator and a discrete plasmonic wire for both negative permeability and permittivity at THz gap. With the proposed highly symmetric gold he...

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Bibliographic Details
Published in:Scientific reports 2017-04, Vol.7 (1), p.45549-45549, Article 45549
Main Authors: Yeh, Ting-Tso, Huang, Tsung-Yu, Tanaka, Takuo, Yen, Ta-Jen
Format: Article
Language:English
Subjects:
639/301/1019/1015
639/624/1075
Acids
Design
Etching
Fourier transforms
Humanities and Social Sciences
Integration
Materials science
multidisciplinary
Permeability
Science
Shells
Silicon nitride
Symmetry
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Summary:We design and construct a three-dimensional (3D) negative index medium (NIM) composed of gold hemispherical shells to supplant an integration of a split-ring resonator and a discrete plasmonic wire for both negative permeability and permittivity at THz gap. With the proposed highly symmetric gold hemispherical shells, the negative index is preserved at multiple incident angles ranging from 0° to 85° for both TE and TM waves, which is further evidenced by negative phase flows in animated field distributions and outweighs conventional fishnet structures with operating frequency shifts when varying incident angles. Finally, the fabrication of the gold hemispherical shells is facilitated via standard UV lithographic and isotropic wet etching processes and characterized by μ-FTIR. The measurement results agree the simulated ones very well.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep45549