Double-Channel Filter Based on the Structure of Two Symmetric Layers with Defects in One-Dimensional Photonic Crystals

Abstract

Using 2×2 transfer matrix method, we numerically investigate a kind of structure in which two symmetric layers with defects are sandwiched in one-dimensional photonic crystals (PCs). The PCs are made of ordinary dielectrics and placed in the air. When a light beam is incident into PCs, the two resonant peaks can be achieved which constitute a couple of photonic channels. The transmittance of the resonant peaks can nearly reach up to 1. Furthermore, the tunability of the resonant peaks is discussed in detail, the results shows that the position of the resonant peak depending on the value of the incident angle. These properties can provide a theoretical basis for design of a new type of tunable double-channel photonic crystal filter.