Three-dimensional broadband tunable terahertz metamaterials

We present optically tunable magnetic three-dimensional (3D) metamaterials at terahertz (THz) frequencies which exhibit a tuning range of ~30% of the resonance frequency. This is accomplished by fabricating 3D array structures consisting of double-split-ring resonators (DSRRs) on silicon on sapphire...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-04, Vol.87 (16), Article 161104
Main Authors: Fan, Kebin, Strikwerda, Andrew C., Zhang, Xin, Averitt, Richard D.
Format: Article
Language:English
Subjects:
Arrays
Broadband
Condensed matter
Metamaterials
Resonant frequencies
Silicon
Three dimensional
Tuning
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Summary:We present optically tunable magnetic three-dimensional (3D) metamaterials at terahertz (THz) frequencies which exhibit a tuning range of ~30% of the resonance frequency. This is accomplished by fabricating 3D array structures consisting of double-split-ring resonators (DSRRs) on silicon on sapphire, fabricated using multilayer electroplating. Photoexcitation of free carriers in the silicon within the capacitive region of the DSRR results in a redshift of the resonant frequency from 1.74 to 1.16 THz. The observed frequency shift leads to a transition from a magnetic-to-bianisotropic response as verified through electromagnetic simulations and parameter retrieval. Our approach extends dynamic metamaterial tuning to magnetic control, and may find applications in switching and modulation, polarization control, or tunable perfect absorbers.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.87.161104