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Tunable plasmonic filter with circular metal–insulator– metal ring resonator containing double narrow gaps

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Abstract

Tunable filter based on two metal–insulator–metal (MIM) waveguides coupled to each other by a ring resonator with double narrow gaps is designed and numerically investigated by finite-difference time-domain (FDTD) simulations. The propagating modes of surface plasmon polaritons (SPPs) are studied. By introducing narrow gaps in ring resonators, the transmission in different resonance modes can be effectively adjusted by changing the gap width (g), and the transmitted peak wavelength has a nonlinear relationship with g. Another structure consisting two cascading ring resonators and regular MIM waveguide have also been proposed. The mechanism based on circular ring resonators with narrow gaps may provide a novel method for designing all-optical integrated components in optical communication and computing.

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Acknowledgements

This work is partially supported by the National Natural Science Foundation of China (Grant Nos 61203211, 11304157) and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 13KJB140006). The authors would especially like to thank Dr Xu Yi from Guangzhou University and Dr Wei Su for their useful discussions.

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, Jiangsu, China

    GAIGE ZHENG, LINHUA XU & YUZHU LIU

  2. Paul Scherrer Institute, WSLA-004, Villegen, Switzerland

    YUZHU LIU

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  1. GAIGE ZHENG
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  2. LINHUA XU
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  3. YUZHU LIU
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Correspondence to GAIGE ZHENG.

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ZHENG, G., XU, L. & LIU, Y. Tunable plasmonic filter with circular metal–insulator– metal ring resonator containing double narrow gaps. Pramana - J Phys 86, 1091–1097 (2016). https://doi.org/10.1007/s12043-015-1127-0

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  • DOI: https://doi.org/10.1007/s12043-015-1127-0

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