Near-infrared linewidth narrowing in plasmonic Fano-resonant metamaterials via tuning of multipole contributions
- 7 August 2017
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 111 (6) , 061104
Abstract
We report on an experimental and computational (multipole decomposition) study of Fano resonance modes in complementary near-IR plasmonic metamaterials. Resonance wavelengths and linewidths can be controlled by changing the symmetry of the unit cell so as to manipulate the balance among multipole contributions. In the present case, geometrically inverting one half of a four-slot (paired asymmetric double bar) unit cell design changes the relative magnitude of magnetic quadrupole and toroidal dipole contributions leading to the enhanced quality factor, figure of merit, and spectral tuning of the plasmonic Fano resonance.Keywords
Funding Information
- Ministry of Education - Singapore (MOE2011-T3-1-005, MOE2015-T2-2-103)
- Nanyang Technological University (M4081282)
- Engineering and Physical Sciences Research Council (EP/M009122/1)
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