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Reconfigurable terahertz plasmonic antenna concept using a graphene stack
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View: Figures


Image of FIG. 1.
FIG. 1.

Proposed graphene dipole antenna. (a) 3D view of the structure. Each half of the antenna consists of two graphene self-biasing patches separated by a thin Al2O3 layer. (b) Cross-section of the antenna. The lower graphene layer is in contact with the metallic electrodes of the source (here a THz photomixer). (c) Setup including the silicon lens for better directivity.

Image of FIG. 2.
FIG. 2.

Real and imaginary parts of the antenna input impedance upon reconfiguration.

Image of FIG. 3.
FIG. 3.

Qualitative transmission line model of the antenna.

Image of FIG. 4.
FIG. 4.

Illustration of the resonant frequency dynamic tuning.

Image of FIG. 5.
FIG. 5.

(a) Radiation efficiency at the resonance versus resonant frequency for different values of μc . (b) Total efficiency (including matching and radiation) of the antenna assuming a 10 kΩ photomixer.

Image of FIG. 6.
FIG. 6.

Total efficiency obtained by simulating the actual two-layer graphene structure of Fig. 1, compared with a single layer of equal and double conductivity, respectively.

Image of FIG. 7.
FIG. 7.

Directivity (H-plane) at the resonance with and without lens. (a) μc = 0 eV, f = 0.8 THz. (b) μc = 0.2 eV, f = 1.8 THz.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reconfigurable terahertz plasmonic antenna concept using a graphene stack