A new route to designing a one-dimensional multiperiodic photonic crystal with adjustable photonic band gap and enhanced electric field localization

Abstract

In this paper, photonic band gap (PBG) properties and electric field distribution of a one-dimensional multiperiodic photonic crystal were theoretically calculated based on a 2 2 transfer matrix method (TMM) using MATLAB software. Stacked layers of Nb2O5, Si and TiO2 were designed as a new model of the one-dimensional three-periodic photonic crystal. The results show that by changing parameters such as the layers order, number of periods, thickness of layers, defect layer thickness and the angle of incident, it is possible to engineer the width and position of PBG while also increasing the electric field intensity inside the photonic crystal. It is shown, that the [NS]2 [T]1 [NS]8 structure (N = Nb2O5, S = Si and T = TiO2) has a wider photonic band gap (PBG) allowing for applications such as laser eye protections. The [NS]2 [T]2 [NS]8 structure is found to be the highest in terms of localization of light in defect layer and being suitable for use in the photocatalysis field.