Large Frequency Range of Omnidirectional Reflection in Si-based One-Dimensional Photonic Crystals

Abstract

We study the omnidirectional photonic band gap in one dimensional photonic crystal of Si/SiO2 structures. Three structures of Si/SiO2 multilayer have been studied. The first structure has filling factor 0.333 and the second structure has filling factor 1.50. The third photonic structure is a combination of first and second structures. Using transfer matrix method, the reflectivities of photonic crystals are plotted as a function of normalized frequency and omnidirectional PBGs are measured. We found that the large frequency range of omnidirectional PBG can be obtained from Si/SiO2 system by combination of 1D photonic band gap structures. For obtaining this large omnidirectional PBG, the directional PBGs of constituent 1D PCs should overlap each other. © 2006 ISRAMT. All Rights Reserved.