Multiple Fano interferences in a plasmonic metamolecule consisting of asymmetric metallic nanodimers

Khai Q. Le, Andrea Alù, Jing Bai

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Abstract

We theoretically explore signatures of plasmonic Fano interferences in a subwavelength plasmonic metamolecule consisting of closely packed asymmetric gold nanodimers, which lead to the possibility of generating multiple Fano resonances in the scattering spectrum. This spectral feature is attributed to the interference between bright and dark plasmonic modes sustained by the constituent nanodimers. The excited Fano dips are highly sensitive in both wavelength and amplitude to geometry and background dielectric medium. The tunability of induced Fano resonances associated with enhanced electric fields from the visible to infrared region provides promising applications, particularly in refractive index sensing, light-trapping, and photon up-converting.

Original languageEnglish (US)
Article number023118
JournalJournal of Applied Physics
Volume117
Issue number2
DOIs
StatePublished - Jan 14 2015

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