Theoretical research on optical properties of gain-assisted plasmonic coupled resonator optical waveguides
加入增益介质的表面等离子体激元耦合共振波导传输特性理论研究

Active materials are proposed to fill into plasmonic coupled resonator optical waveguide constructed with metal rings. Optical properties including transmission, dispersion relation and group index of the waveguide are illustrated by performing the transfer matrix method analysis and the finite difference time domain simulation. The results show that the anomalous and the normal dispersions of the active material near the resonance frequency will help to flatten or slope the dispersion relation produced by the geometric structure, leading to an amplified or attenuated group index of the waveguide. Additionally, we can real-time tune the optical properties of the waveguide by electrically or optically pumping the active material. Our results verify a feasible way for the application of such a waveguide in high desity integration of optical circuits.