The purpose of this paper is to investigate the terahertz electric field in two-dimensional photonic crystal with bend waveguides. This waveguide is made based on photonic crystal slab structure consist of dielectric rods in air with a triangular lattice that this structure has three waveguide coupled by two point defect. We investigate the effect of changing the radius of each defect on the amplitude of the electric field from any waveguide and consequence show that change size of cavity effects on guide frequency mode in waveguides. We can fabrication different optical devices such as filter, switch and attenuator with adjust radius of defect. Simulation is obtained by using of finite element method (FEM).

Keywords: optical Attenuator, optical switch, photonic crystal filter, photonic crystal waveguide

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