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Nanomaterials 2018, 8(8), 568; https://doi.org/10.3390/nano8080568

Nanostrip-Induced High Tunability Multipolar Fano Resonances in a Au Ring-Strip Nanosystem

1,2, 1,2, 3, 1,2, 3,*, 1,2, 1,2, 1,2, 4,* and 5,*
1
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China
2
Sichuan Civil-Military Integration Institute, Mianyang 621010, China
3
Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
4
School of Energy Science and Engineering, Central South University, Changsha 410083, China
5
College of Physics and Electronics, Central South University, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Received: 26 June 2018 / Revised: 20 July 2018 / Accepted: 23 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Metallic Nanostructures)
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Abstract

Surface plasmon resonances of a Au ring-strip nanosystem with tunable multipolar Fano resonances have been investigated based on the finite-difference time-domain (FDTD) method. Abundant plasmon properties of a Au ring-strip nanosystem can be obtained on the basis of the unique electronic properties of different geometry parameters. In our research models, these multipolar Fano resonances are induced and can be tuned independently by changing the geometry parameters of the Au ring-strip nanosystem. Complex electric field distributions excited by the Au ring-strip nanosystem provide possibility to form dark plasmonic modes. Multipolar Fano resonances display strong light extinction in the Au ring-strip nanosystem, which can offer a new approach for an optical tunable filter, optical switching, and advanced biosensing. View Full-Text
Keywords: Au ring-strip nanosystem; multipolar Fano resonances; surface plasmon resonances; FDTD method Au ring-strip nanosystem; multipolar Fano resonances; surface plasmon resonances; FDTD method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yi, Z.; Li, X.; Xu, X.; Chen, X.; Ye, X.; Yi, Y.; Duan, T.; Tang, Y.; Liu, J.; Yi, Y. Nanostrip-Induced High Tunability Multipolar Fano Resonances in a Au Ring-Strip Nanosystem. Nanomaterials 2018, 8, 568.

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