Development of an innovative THz narrow bandpass filter based on a cylindrical periodic structure using the transfer matrix method

Abstract

Abstract This article presents the development of an innovative terahertz (THz) narrow bandpass filter based on a cylindrical periodic structure, utilizing the Transfer Matrix Method (TMM). The study systematically analyzes and optimizes cylindrical photonic waveguides (PCWs) with an introduced defect to enhance transmission characteristics within the THz frequency range. By introducing a defect into a periodic arrangement of cylindrical dielectric waveguides, we demonstrate the transformation of a notch filter into a narrow bandpass filter. Our work investigates the influence of geometrical parameters (such as defect length and radius) and material properties (such as permittivity) on the transmission spectrum of the filter. The results show significant changes in transmission peaks, indicating the possibility of precise control and optimization of filter performance. These results have important applications for advanced telecommunications, sensing and biomedical imaging, where highly selective and efficient THz filters are essential.