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Open AccessArticle

Tunable Multipolar Fano Resonances and Electric Field Enhancements in Au Ring-Disk Plasmonic Nanostructures

by Rong Qiu 1,2, Hang Lin 1,2, Jing Huang 1,2, Cuiping Liang 1,2 and Zao Yi 1,2,*
1
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China
2
Sichuan Civil-Military Integration Institute, SCII, Mianyang 621010, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1576; https://doi.org/10.3390/ma11091576
Received: 2 July 2018 / Revised: 22 August 2018 / Accepted: 29 August 2018 / Published: 1 September 2018
We theoretically research the characteristics of tunable multipolar Fano resonances in novel-designed Au ring-disk plasmonic nanostructures. We systematically study some structural parameters that influence the multipolar Fano resonances of the nanostructures. Adjustment of the radius (R1 and R2) of the Au ring, the radius (R3) of the Au disk and the thickness (H) of the Au ring-disk can effectively adjust the multipolar Fano resonances. The complex field distributions excited by a Au ring-disk can produce dark resonance modes. At the frequency of the multipolar Fano resonances, strong localized field distributions can be obtained. The Fano resonances exhibit strong light-extinction properties in Au ring-disk nanostructures, which can be applied to an optical tunable filter and optical switch. View Full-Text
Keywords: Au ring-disk nanostructures; Fano resonances; multipolar; finite-difference time-domain Au ring-disk nanostructures; Fano resonances; multipolar; finite-difference time-domain
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MDPI and ACS Style

Qiu, R.; Lin, H.; Huang, J.; Liang, C.; Yi, Z. Tunable Multipolar Fano Resonances and Electric Field Enhancements in Au Ring-Disk Plasmonic Nanostructures. Materials 2018, 11, 1576.

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