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Open AccessArticle

Independently Tunable Fano Resonances Based on the Coupled Hetero-Cavities in a Plasmonic MIM System

by Qiong Wang 1,2, Zhengbiao Ouyang 1,2,*, Mi Lin 1,2 and Qiang Liu 1,2
1
THz Technical Research Center of Shenzhen University, Shenzhen University, Shenzhen 518060, China
2
College of Electronic Science &Technology, Shenzhen University, Shenzhen 518060, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1675; https://doi.org/10.3390/ma11091675
Received: 17 August 2018 / Revised: 5 September 2018 / Accepted: 6 September 2018 / Published: 10 September 2018
(This article belongs to the Special Issue New Horizon of Plasmonics and Metamaterials)
In this paper, based on coupled hetero-cavities, multiple Fano resonances are produced and tuned in a plasmonic metal-insulator-metal (MIM) system. The structure comprises a rectangular cavity, a side-coupled waveguide, and an upper-coupled circular cavity with a metal-strip core, used to modulate Fano resonances. Three Fano resonances can be realized, which originate from interference of the cavity modes between the rectangular cavity and the metal-strip-core circular cavity. Due to the different cavity-cavity coupling mechanisms, the three Fano resonances can be divided into two groups, and each group of Fano resonances can be well tuned independently by changing the different cavity parameters, which can allow great flexibility to control multiple Fano resonances in practice. Furthermore, through carefully adjusting the direction angle of the metal-strip core in the circular cavity, the position and lineshape of the Fano resonances can be easily tuned. Notably, reversal asymmetry takes place for one of the Fano resonances. The influence of the direction angle on the figure of merit (FOM) value is also investigated. A maximum FOM of 3436 is obtained. The proposed structure has high transmission, sharp Fano lineshape, and high sensitivity to change in the background refractive index. This research provides effective guidance to tune multiple Fano resonances, which has important applications in nanosensors, filters, modulators, and other related plasmonic devices. View Full-Text
Keywords: tunable fano resonances; surface plasmon polaritons; coupled cavities; finite element method tunable fano resonances; surface plasmon polaritons; coupled cavities; finite element method
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Wang, Q.; Ouyang, Z.; Lin, M.; Liu, Q. Independently Tunable Fano Resonances Based on the Coupled Hetero-Cavities in a Plasmonic MIM System. Materials 2018, 11, 1675.

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