Using of Generalized Goertzel Algorithm for FDTD Calculation of the Transmission and Reflection Spectra of Periodic Structures

Finite-difference time-domain (FDTD) method is frequently used for calculation of transmission and reflection characteristics of periodic structures. We propose a hybrid FDTD technique for evaluation of the transmittance and reflectance spectra of periodic structures that significantly reduces the usage of computer memory and time of the calculation. In the considered case, calculation time and memory occupation were reduced up to 30% and 20%, respectively, compared to the standard FDTD procedure. Calculated results fit well in the experimentally measured data.