RT - Journal Article T1 - Investigation effect of cavity on waveguide’s mode 2D photonic crystal with bend waveguide in frequency Terahertz rang for optical device JF - opsi YR - 2015 JO - opsi VO - 21 IS - 0 UR - http://opsi.ir/article-1-605-en.html SP - 429 EP - 432 K1 - optical Attenuator K1 - optical switch K1 - photonic crystal filter K1 - photonic crystal waveguide AB - 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). LA eng UL http://opsi.ir/article-1-605-en.html M3 ER -