帮我从新表达下面这段话让逻辑和内容更加符合论文书写要求：In this article we establish a refinement theoretic model based on the transfer matrix method TMM to describe the effect of etching MRU on the straight waveguide of MRR The

In this article, we develop a refinement theoretic model using the transfer matrix method (TMM) to describe the impact of etching MRU on the straight waveguide of MRR. The model accurately measures the changes in transmission and reflection lineshape and intensity due to variations in MRU position and size. Compared to the single nanoparticle detection of MRR, MRU induces a strong CCW mode in the cavity. This heightened sensitivity to reflections, from both single nanoparticles and rough cavity walls, results in pronounced shifts in resonant lineshape. Consequently, this structure can be employed for more precise single nanoparticle detection. Through numerical calculation and FDTD simulation, we predict and observe the shifting and splitting of Fano lineshape. The proposed model in this paper establishes a novel foundation for the regulation and application of microcavity Fano resonance lineshape