Abstract
Photonic crystals are alternating structures widely used to design various types of logic circuits. In this paper, a 2 × 1 multiplexer is designed and simulated based on two-dimensional photonic crystals with a cubic lattice. Silicon rods in the air were used to design this multiplexer. Only linear defects were considered in the design of the structure. In other words, none of the rods were changed and all Si rods were the same, which is one of the advantages of this structure. Optical sources with a wavelength of 1.55 µm were utilized in the inputs and select line. The size of the structure was 12.16 µm × 12.16 µm. The small dimension and the simplicity of the structure make it a suitable candidate in optically integrated circuits