Modes excitation in five-mode photonic crystal waveguides of triangular lattice

摘要

We study modes excitation with input field of different positions in five-mode photonic crystal waveguides of triangular lattice. The five-mode photonic crystal waveguides is formed by removing five rows rods in 2D photonic crystals of a triangular lattice of dielectric rods in air. The 0th mode, the 1st mode and the 2nd modes are selectively excited. The input field with different positions can excite different modes due to the field intensity distribution of modes. When the input field locates at the position of the zero field intensity of the waveguide mode, the mode can not be excited. The superposition of different modes can leads to different field intensity distribution. The finite-difference time-domain method is used to obtain the excited field distributions.