Electromagnetic Analysis of Grating Reflectors: The Relation between Quality Factors and Structural Parameters

In this work, we estimate the quality factor of grating reflectors with properties and theories of the planar dielectric waveguide. The scattered electric field due to perturbation of dielectric difference at the waveguide’s boundary is a huge factor to estimate the quality factor of grating reflectors. Then, we use simulation software COMSOL Multiphysics to calculate the quality factor with different structure parameters to clarify and prove we can reduce the time of simulation. We analyze the frequency response of grating reflectors with Couple-Mode Theory and use the full-wave simulation to verify the frequency response. We can save lots of time on the simulation and obtain much more accurate frequency responses.