Topology Optimization of Millimeter-wave to Optical Devices Using Two-Dimensional Full-Vectorial Finite Element Method

In order to efficiently design millimeter-wave, THz, and optical devices, in which polarization coupling occurs, we propose topology optimization method based on two-dimensional full-vectorial finite element method (2D-FVFEM). We employ function expansion method with high design freedom for expressing device structure in design region and adjoint variable method for efficient calculation of sensitivity used in gradient-based optimization.