Dark and bright mode hybridization: From electric to magnetic Fano resonances. (January 2016)

• Record Type: Journal Article
• Authors: Panaro, S.; De Angelis, F.; Toma, A.
• Is Part Of: Optics and lasers in engineering. Volume 76(2016)
• Page Start: 64
• Page End: 69
• Publication Date: 2016-01
• Subjects: Localized surface plasmon -- Dark modes -- Fano resonances -- Near-field coupling -- Magnetic-like modes; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2015.03.019
• Languages: English
• ISSNs: 0143-8166

Abstract

Abstract: The excitation of plasmonic Fano resonances leads to a dual advantage in nano-photonics, in terms of local field enhancement and far-field spectral selectivity. Nevertheless, a remarkable challenge related to the hybridization between bright and dark plasmonic modes, i.e. between the two elements cooperating to the Fano resonance generation, consists in the sub-wavelength activation of dark modes via near-field channel. In this regard, strongly coupled plasmonic nano-assemblies are ideal systems providing a highly efficient way towards their excitation. Here, we analyze two trimer nano-architectures supporting respectively electric and magnetic Fano resonances. The different approaches employed for describing the two systems highlighted the role that the near-field coupling and the LSPs de-phasing separately play in the Fano hybridization phenomena. Highlights: Plasmonic Fano resonant nanostructures for bio-detection. Theoretical analysis of near-field coupling and LSPs de-phasing in Fano resonances. Excitation of electric and magnetic hot-spots in Fano resonance condition.