Excitation of Plasmon Waveguide Mode by Counterpart Coaxial Split Ring Resonators

Abstract

The improvement of excitation efficiency from free space to the longitudinal propagating plasmonic-guided wave attracts growing researchers’ interests recently. In this work, a coupling structure composed of counterpart coaxial split ring resonators and a plasmonic stripe waveguide was proposed to investigate the characteristics of the plasmonic waveguide mode excitation by using finite-difference time-domain (FDTD) method. Results showed that an extremely wide spectrum bandwidth about 930 nm which covered the communication region from 1070 nm to 2 μm was achieved and the excitation efficiencies at resonant wavelengths of 1235 nm and 1636 nm reached 36.1% and 24.5%, respectively. And the coupling wavelength can be modulated by rotating the outer split ring. Our research provides potential applications for next-generation plasmonic integrated chips and functional devices.