Heterostructure photonic crystal channel drop filters using mirror cavities

In this paper, a heterostructure channel drop filter in two-dimensional photonic crystals based on mirror cavities is investigated. First a channel drop filter using mirror cavities is presented. Then in order to achieve a three output port filter, we present a heterostructure built on a hybrid two-dimensional (2D) photonic crystal that includes two different refractive indices. Our numeric simulation with the finite-difference time-domain (FDTD) technique shows that the heterostructure has acceptable output efficiency over 80%. Finally, by applying a theoretical approach (coupled mode theory), the physical mechanism behind these structures is explained.