Photonic crystal wavelength-selective attenuators: Design and modeling

The operation of a wavelength-selective attenuator, which is based on modified photonic crystal (PC) T and Y-branch waveguides, is analyzed using theoretical and numerical analysis. The coupling mode theory (CMT) is employed to drive the necessary conditions for achieving perfect transmission and reflection. It has been shown that when the decay rates into the three ports of the proposed device are equal, an attenuation between 0% and 100% can be obtained. The finite-difference time-domain (FDTD) simulation results of the proposed wavelength-selective attenuator which is implemented in two-dimensional PCs (2D-PC), show that the analysis is valid.