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24 January 2019 Tunable multi-modes resonator based on MIM plasmonic waveguides with circular cavity and rectangular baffle
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In this manuscript, a metal-insulator-metal(MIM) plasmonic waveguide coupled with a circular cavity and a rectangular baffle has been proposed and numerically investigated. Due to the existence of the rectangular baffle and its asymmetry position relative to the feeding ports in the circular cavity, the resonator exhibits multiple sharp Fano-like resonances. The behavior of the proposed structure is analyzed in details with finite element method. The spectral line profile and resonance wavelength can be easily tuned by the parameters of this proposed structure, such as the radius of circular cavity, the height h of baffle and its position, etc. Using the relationship between the height of baffle and resonant wavelength λ, its sensing capabilities are demonstrated through the responses for various refractive indices. The Figure of Merit can be achieved as high as 4.65×104. As an example, a compact 1×2 plasmonic wavelength demultiplexer has been designed with different height of baffles. Moreover, this 1×2 wavelength demultiplexer can also act as a metal detector because different metallic baffle has a different response peak. Our compact plasmonic structure may have widely potential applications in nanosensors, optical communication, optical detection and integration plasmonic devices.
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Lin Cheng, Xu Li, Zhouqi Zhang, Pengfei Cao, Xiaodong He, Qunfeng Shao, and Yuee Li "Tunable multi-modes resonator based on MIM plasmonic waveguides with circular cavity and rectangular baffle", Proc. SPIE 10840, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics, 108400C (24 January 2019);

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