Formation of Infrared Regions of Transparency in One-Dimensional Silicon Photonic Crystals

The optical properties of three-component one-dimensional photonic crystal (1-D PC) structures were investigated by modeling them as two-component PCs with an additional regular
t
-layer, using the gap map approach and the transfer matrix method. Numerical results demonstrate that the introduction of the
t
-layer affects the properties of the high-order photonic band gaps, replacing them with transmission bands and creating regions of transparency over certain wavelength ranges. For the first time, a map of the transmission bands for a three-component 1-D PC was generated. This map constitutes a unique design tool for infrared optical filters for silicon-based photonic integrated circuits.