Analysis of a Proposed Multi Channel Drop Photonic Crystal Filter by The FDTD

We have derived the general condition to achieved 100% drop efficiency in the resonant tunneling-based channel drop filters of a three port system with reflection feedback. Based on these theoretical analysis, a six- channel drop filter and some other multi-channel filters are designed in two-dimensional photonic crystals (2D PCs) with square lattice of dielectric rods in air. The performance of the designed filter has been numerically calculated using the finitedifference time-domain (FDTD) method. In the designed filter, drop efficiencies larger than 95% in all channels have been achieved.