Axially Symmetric Diffraction Grating on Substrate in Dielectric Waveguide

Today there are a lot of different grating that needs effective calculation techniques. In this paper calculation approach for axially symmetric grating with many elements is proposed. The proposed technique is based on Body Of Revolution Finite Difference in Time Domain (BOR FDTD) method. This method is used for calculation of reflection and transmission coefficients for different modes of a hollow dielectric waveguide for axially symmetric grating. Effective approach for the dielectric substrate accounting is proposed. Some numerical results for the grating both with and without substrate are presented.