Optical DEMUX using silicon-silica based 2D photonic crystal

A 1:2 optical de-multiplexer is designed using two dimensional photonic crystal composed of silicon rods embedded in silicon dioxide slab to form a square lattice. The design is based on the concept used by Niemi et. al for a two dimensional silicon-air photonic crystal with triangular lattice. Two different configurations for the desired DEMUX are proposed. They, while efficiently coupling the channel wavelengths to intended waveguides, ensure sharp spectral response and unwanted signal suppression. The structures are simulated using CST Microwave Studio.