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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Acknowledgments
The authors would acknowledge financial supports from the National Natural Science Foundation of China (Nos. 11304159, 11104136, 61471189, 61372045, and 61101012), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Nos. 20133223120006 and 20123223120003), the Qing Lan Project, and the Natural Science Foundation of Zhejiang Province (No. LY14A040004).
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Chen, J., Fan, W., Mao, P. et al. Tailoring Plasmon Lifetime in Suspended Nanoantenna Arrays for High-Performance Plasmon Sensing. Plasmonics 12, 529–534 (2017). https://doi.org/10.1007/s11468-016-0294-2
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DOI: https://doi.org/10.1007/s11468-016-0294-2