Enhanced localized plasmonic characteristics based on coaxial defective-disk and ring structures. (10th June 2015)

• Record Type: Journal Article
• Authors: Yuan, Minghui; Chen, Changying; Chen, Lin; Wei, Ling; Fang, Bo; Cheng, Zhaoxiang; Zhu, Yiming
• Is Part Of: Journal of optics. Volume 17:Number 7(2015:Jul.)
• Publication Date: 2015-06-10
• Subjects: metamaterials -- electromagnetic optics -- resonance; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8978/17/7/075101
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: We have illustrated the localized plasmonic properties on the terahertz region based on a coaxial disk and ring structure (DRS) and a defective-disk and ring structure (DDRS). Two resonances can be observed in these coaxial structures, which arise from the anti-bonding and bonding resonance hybridization. Compared with DRS, an enhanced localized plasmonic effect at a higher-frequency resonance is observed on the DDRS, which is owing to a new strong dipole mode evoked at the edge of the wedge-shaped slice. Moreover, this higher-frequency localized plasmonic resonance of the DDRS could be further enhanced by increasing the depth of the wedge-shaped slice due to the coupling between the dipole resonance of the deeper wedge-shaped slice and the outer ring. Therefore, by using higher-order enhanced localized plasmonic characteristics, the designed DDRS is promising in sensing, spectroscopy and slow light effect.