Constructive-interference-enhanced Fano resonance of silver plasmonic heptamers with a substrate mirror: a numerical study | Zendy

Xupeng Zhu | Zendy; Huimin Shi | Zendy; Shi Zhang | Zendy; Quanhui Liu | Zendy; Huigao Duan | Zendy

Open Access

Constructive-interference-enhanced Fano resonance of silver plasmonic heptamers with a substrate mirror: a numerical study

Author(s) -

Xupeng Zhu,

Huimin Shi,

Shi Zhang,

Quanhui Liu,

Huigao Duan

Publication year - 2017

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.25.009938

Subject(s) - fano resonance , plasmon , fano plane , materials science , substrate (aquarium) , optics , surface plasmon resonance , optoelectronics , interference (communication) , resonance (particle physics) , silicon , metamaterial , interference lithography , nanotechnology , physics , nanoparticle , fabrication , telecommunications , computer science , geometry , oceanography , mathematics , particle physics , geology , medicine , channel (broadcasting) , alternative medicine , pathology

Plasmonic nanostructures with strong Fano resonance are of fundamental interest. Here, our systematic simulations show that rational positioning of a silver plasmonic heptamer above a highly reflective substrate mirror can significantly enhance its intrinsic Fano-resonance intensity. The silver nanodisk heptamer positioned at an appropriate distance above the reflective substrate enables 2.4 times field enhancement and 3.6 times deeper Fano-dip respectively compared to the heptamer directly placed on silicon oxide substrate. Besides, our results indicate that the Fano-dip position does not shift when the silver nanodisk heptamer gradually shifts away from the reflective substrate mirror (≥60 nm).

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