Numerical analysis of end-fire coupling of surface plasmon polaritons in a metal-insulator-metal waveguide using a simple photoplastic connector
We propose a design for efficient end-fire coupling of surface plasmon polaritons in a metal-insulator-metal (MIM) waveguide with an optical fiber as part of a simple photoplastic connector. The design was analyzed and optimized using the three-dimensional finite-difference time-domain method. The calculated excitation efficiency coefficient of the waveguide is 83.7% (?0.77 dB) at a wavelength of 405 nm. This design enables simple connection of an optical fiber to a MIM waveguide and highly efficient local excitation of the waveguide. Moreover, the length of the metallic elements of the waveguide, and thus the dissipative losses, can be reduced. The proposed design may be useful in plasmonic-type waveguide applications such as near-field investigation of live cells and other objects with super-resolution.
基金项目：National Natural Science Foundation of China (NSFC)10.13039/501100001809 (61571399); “The Belt and Road” International Cooperation of Zhejiang Province, China (2015C04005).
Anatoliy S. Lapchuk：Institute for Information Recording of NAS of Ukraine, Shpak Str. 2, Kiev 03113, Ukraine
Ming-Lei Fu：College of Science, Zhejiang University of Technology, Hangzhou 310023, China
Andriy A. Kryuchyn：Institute for Information Recording of NAS of Ukraine, Shpak Str. 2, Kiev 03113, Ukraine
Hao-Ran Huang：College of Science, Zhejiang University of Technology, Hangzhou 310023, China
Zi-Chun Le：College of Science, Zhejiang University of Technology, Hangzhou 310023, China
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Yevhenii M. Morozov, Anatoliy S. Lapchuk, Ming-Lei Fu, Andriy A. Kryuchyn, Hao-Ran Huang, and Zi-Chun Le, "Numerical analysis of end-fire coupling of surface plasmon polaritons in a metal-insulator-metal waveguide using a simple photoplastic connector," Photonics Research 6(3), 000149 (2018)