In this learning track, we will learn about the discontinuous Galerkin time-domain (DGTD) method and its typical applications. We will begin by discussing the basic physics behind the DGTD solver and compare it to Lumerical’s finite-difference time-domain (FDTD) solver. Then, we will demonstrate a typical workflow for setting up an optical simulation using the DGTD solver to obtain the absorption and scattering cross-section of a gold nanoparticle due to Mie scattering. Finally, we will learn common simulation tips for the Lumerical DGTD solver.