Selective modes excitation in multimode photonic crystal waveguides

We investigate modes excitation with the input field of different positions in two-dimensional multimode photonic crystal waveguides. Odd modes can be selectively excited by the input field of odd symmetry. 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 waveguide modes is zero and the modes are not excited. The finite-difference time-domain method is used to obtain the excited field distributions.

Research highlights
► We investigate modes excitation with the input field of different positions in two-dimensional multimode photonic crystal waveguides.
► Odd modes can be selectively excited by the input field of odd symmetry.
► The input field with different positions can excite different modes due to the field intensity distribution of modes.