Abstract In this paper, multiple Fano resonances are produced and analyzed in an end-coupled resonator system. The proposed structure is composed of a rectangular resonator and semi-ring resonators. Multiple interference coupled mode theory method is used to confirm the simulation results of finite difference-time domain method. Results indicate Fano resonances can be independently controlled by the radius of the semi-ring resonator. For sensing, the maximum refractive index sensitivity is 1280nm/RIUdocumentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$${1280};{text{nm}}/{text{RIU}}$$end{document} for FR 5 (RIU is the refractive index unit). Moreover, the maximum optical delay time is about???0.265?ps and 0.095?ps. The sharp spectrum has important application in slow light and sensing; the different response to the variations of the structural sizes has important application in multi-parameter sensing in complicated environments.
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