Deformed Octonacci photonic crystal made of modified polyvinyl alcohol films with hybrid AgAlO2 nanoparticles for slowing optical signals

Abstract

A high slowdown factor (SDF) of optical signals is achieved using an optimized and geometrically deformed quasi-periodic Octonacci photonic structure. Modified polyvinyl alcohol doped with 2.0 wt% AgAlO 2 nanoparticles and pure polyvinyl alcohol are employed as the two constituent materials. The transfer matrix method and finite element method are utilized to determine the optical properties and the SDF for TE and TM polarization modes. The Octonacci distribution significantly influences the propagation speed of light. Increasing the optical thickness of the layers enhances the SDF. Further improvements are observed by applying geometric deformation to the layer thicknesses. A maximum SDF of 226.29 is obtained when the Octonacci sequence is set at the 7th iteration, the reference wavelength (λ 0 ) is 1.5 μm, and the deformation degree ( h ) is 0.1. The results are compared with previous studies. The proposed structure shows potential for applications in optical telecommunications, sensing, and quantum information processing.