Terahertz localized plasmonic properties of subwavelength ring and coaxial geometries

Xinchao Lu; Weili Zhang
May 2009
Applied Physics Letters;5/4/2009, Vol. 94 Issue 18, p181106
Academic Journal
We study terahertz properties of periodic arrays of subwavelength metallic ring and coaxial ring-disk structures. Terahertz time-domain spectroscopy and numerical simulations have revealed unique resonance behaviors at terahertz frequencies. A high-frequency antisymmetric resonance in the rings concurs simultaneously with the symmetric mode. In the coaxial structures, the strong and weak resonance interactions are characterized by the plasmon hybridization theory, while the anomalous interaction results in a degenerate resonance which has not yet been observed at visible frequencies. The frequency tunability and strong electric field enhancement in such subwavelength structures are promising in terahertz sensing, spectroscopy, and integrated components.


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