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Fishbone-Like High-Efficiency Low-Pass Plasmonic Filter Based on Double-Layered Conformal Surface Plasmons

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Abstract

In this work, we report a fishbone-like high-efficiency low-pass plasmonic filter based on a double-layered conformal surface plasmon waveguide (CSPW) which consists of double-layered symmetrical metal gratings (SMGs) of fishbone shape. Efficient mode conversion between the quasi-transverse electromagnetic (TEM) waves in the microstrip line and the conformal surface plasmons (CSPs) on the double-layered CSPW is realized by using gradient double-layered SMGs and impedance matching technique. Experimental results of the transmission and reflection coefficients of the straight sample show excellent loss-pass performance and agree well with the numerical simulations. The curved samples exhibit low radiation loss when the double-layered CSPW is conformal or even bent thanks to the high confinement of CSPs. The proposed structure can find potential applications in integrating conventional circuits with CSPs devices at microwave and terahertz frequencies.

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Acknowledgments

This work was supported in part by the Foundation of State Key Laboratory of Millimeter Waves, Southeast University, China, under Grant No. K201603, in part by the Natural Science Foundation of Jiangsu Province under Grant No. BK20151480, in part by the Fundamental Research Funds for the Central Universities under Grant No. NS2016039, in part by the China Scholarship Council, in part by the Funding for Outstanding Doctoral Dissertation in NUAA under Grant No. BCXJ15 −04 and in part by the priority academic program development of Jiangsu Higher Education Institutions.

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Correspondence to Zhuo Li.

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Liu, L., Li, Z., Xu, B. et al. Fishbone-Like High-Efficiency Low-Pass Plasmonic Filter Based on Double-Layered Conformal Surface Plasmons. Plasmonics 12, 439–444 (2017). https://doi.org/10.1007/s11468-016-0283-5

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  • DOI: https://doi.org/10.1007/s11468-016-0283-5

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