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Defect‐Induced Fano Resonances in Corrugated Plasmonic Metamaterials
Author(s) -
Chen Lin,
Xu Ningning,
Singh Leena,
Cui Tiejun,
Singh Ranjan,
Zhu Yiming,
Zhang Weili
Publication year - 2017
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201600960
Subject(s) - fano resonance , multipole expansion , resonance (particle physics) , excited state , fano plane , plasmon , terahertz radiation , dipole , physics , metamaterial , optics , materials science , molecular physics , condensed matter physics , atomic physics , mathematics , quantum mechanics , pure mathematics
A novel defect‐induced planar meta‐atom that supports multiple Fano resonances in a defective corrugated metallic disk (CMD) structure is proposed. Numerical and experimental results reveal that multiple Fano resonances can be excited at terahertz frequencies when the symmetry of the CMD is broken by introducing a small angular defect. These multiple Fano resonances result from mutual coupling between the bright dipolar mode evoked by the edge of the wedge‐shaped slice and dark multipole spoof localized surface plasmon modes. Furthermore, the influence of the angle of defect on the Q ‐factor and the resonance intensity of the quadrupolar resonance peak is investigated. Large values of figure of merit are obtained due to higher Fano resonance intensity and Q ‐factor. Results from two defective slices in the CMD structure validate the mechanism of the observed phenomenon. The findings of this work would enable a defect‐induced Fano resonance platform for biosensing, terahertz domain filtering, and strong light–matter interactions.