TITLE

Terahertz localized plasmonic properties of subwavelength ring and coaxial geometries

AUTHOR(S)
Xinchao Lu; Weili Zhang
PUB. DATE
May 2009
SOURCE
Applied Physics Letters;5/4/2009, Vol. 94 Issue 18, p181106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
39354720

 

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