A novel reliable optimization method for output beam forming of photonic crystal waveguide terminated with surface CROW

In this paper, in order to achieve more coupling between photonic crystal waveguide (PCW) and photonic devices, we have used a new optimization method to create output focused beams. The PCW terminated with coupled resonator optical waveguide (CROW) is analyzed by the finite difference time domain (FDTD) method. We have optimized the rods of CROW one by one in a special sequence. Our proposed method is more reliable and much faster than other optimization methods such as particle swarm optimization (PSO) and genetic algorithms. The optimized structure compared to the non-optimized one has a factor of 4.73 times improvement in the intensity of the PCW output main lobe.