Tailoring Plasmon Lifetime in Suspended Nanoantenna Arrays for High-Performance Plasmon Sensing |
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| Authors: | Jing Chen Wenfang Fan Peng Mao Chaojun Tang Yuanjian Liu Ying Yu Labao Zhang |
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| Affiliation: | 1.College of Electronic Science and Engineering,Nanjing University of Posts and Telecommunications,Nanjing,China;2.Jiangsu Provincial Engineering Laboratory for RF Integration and Micropackaging,Nanjing,China;3.National Laboratory of Solid State Microstructures,Nanjing University,Nanjing,China;4.Department of Applied Physics,Zhejiang University of Technology,Hangzhou,China |
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| Abstract: | We demonstrate significantly longer plasmon lifetime and stronger electric field enhancement by lifting the nanoantenna arrays above the substrate by dielectric nanopillars. The role of the pillar is to offer a more homogeneous dielectric background allowing stronger diffraction coupling among plasmonic nanoantennas leading to a Fanolike asymmetric lineshape. It is found that the electric fields around the nanoantennas can be greatly enhanced when the Fanolike resonance is excited, and a 4.2 times enhancement is achieved compared with the pure resonance in individual nanoantennas. Furthermore, only a collective surface mode with its electric fields of the same direction as the induced electric moment in the nanoantennas could mediate the excitation of such a Fanolike resonance. More importantly, the sensitivity and the figure of merit (FOM) of this plasmonic structure can reach as high as 900 nm/RIU and 53, respectively. Our study offers a new, simple, and efficient way to design the plasmonic systems with desired electric field enhancement and spectral lineshape for different applications. |
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