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Terahertz localized plasmonic properties of subwavelength ring and coaxial geometries
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Measured amplitude transmission of the rings with various . (b) Resonant frequencies (squares) and transmission minima (dots) as functions of . Simulation results: [(c) and (d)] electric field distributions on the surface of the rings; [(e) and (f)] electric field distributions at cross section cutting along the ring axis; [(g) and (h)] current density. Two ring arrays of fixed and [(c), (e), and (g)] , resonating at 0.55 THz; [(d), (f), and (h)] , resonating at 0.50 THz.

Image of FIG. 2.
FIG. 2.

(a) Measured amplitude transmission of the coaxial structures with fixed , , and various . Simulated electric field distributions of (b) low-frequency antibonding resonance at 0.41 THz and (c) high-frequency bonding resonance at 0.76 THz of the coaxial structure of , , and .

Image of FIG. 3.
FIG. 3.

Measured transmission of the ring only (, red), disk only (, green), and coaxial (, black) resonators, respectively, with fixed for (a) strong, (b) weak, (c) and anomalous interactions. (d) Calculated resonance coupling strength, at various gaps between the ring and disk. Inset: measured increase in resonance separation in the coaxials compared to that of the ring and disk-only structures. The dotted lines are guide to the eyes.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz localized plasmonic properties of subwavelength ring and coaxial geometries