Programmable coding photonic topological edge waveguide

In order to obtain reconfigurable topological photonic waveguides, we design a two-dimensional photonic crystal with compound triangular lattice. Through rotating the dielectric rods, we change the topological phase of the lattice and achieve the topological edge states. Through the rotation of rods, we divide the two-dimensional structure space into "0" and "1" blocks made of the topologically trivial and nontrivial lattices, respectively. Through programming the codes of "0" and "1," we can realize diverse transport pathways of light flow. The controllable light pathways will play important role in the optical circuit. The programmable design results have been demonstrated through the simulations of electromagnetic wave transport. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)