The 90 Waveguide Bends Based on the New Geometric Forms of Photonic Crystals

Different types of optical waveguides with 90° bend are provided in this paper using new geometrical structures from 2D photonic crystal in the form of dielectric rods all arranged in a square lattice. Plane wave expansion and finite difference time domain methods have been utilized in TM polarization mode at CFS-PML boundary condition as the absorber area surrounding the calculational area in order to calculate the results and also simulate the 90° optical waveguides. The results of simulation indicate that it is possible to design 90° waveguides in different frequency ranges and new geometrical structures.