Ansys Lumerical DGTD

The industry standard for 3D electromagnetic (EM) simulation



Gaussian Beam Propagation

  • In many laser optics applications, the laser beam is taken to be Gaussian with an optimal Gaussian distribution for the irradiance profile.
  • For this reason, Lumerical DGTD has incorporated equations and other parameters that engineers will need to calculate the laser’s divergence from perfect Gaussian behavior.
  • The M2 factor, also known as the beam quality factor, contrasts a real laser beam’s performance with a diffraction-limited Gaussian beam.
  • Custom Gaussian irradiance profiles can be created using DGTD, enabling symmetry analyses around COB distances to measure directional propagation increases.

Bloch Boundary Conditions (BC’s)

  • Lumerical DGTD enables seamless phase correction when simulating a plane wave propagating at a specified angle.
  • Bloch boundary conditions are employed in a number of settings, but they are most frequently used in simulations of periodic structures illuminated by an angled plane wave source.
  • When determining the in-plane wavevector is important, Bloch Boundary Conditions (BCs) are crucial in contextualizing results.  For instance, they are routinely utilized by photonics engineers in Bandstructure computations.

Interoperable with Multiphysics Solvers

Several multiphysics simulations are offered by Ansys Lumerical DGTD in addition to other Lumerical solutions:

  • Photovoltaic (FDTD/DGTD, CHARGE & HEAT)
  • Electro-optic (CHARGE & FDTD/DGTD/FDE)
  • Opto-thermal (FDTD/DGTD & HEAT)
  • Plasmonics (DGTD & HEAT)]

Optical Phase Change Materials with Broadband Transparency

  • Designers frequently assume that isoelectronic substitution will tend to widen the optical bandgap, which will reduce the near-infrared interband absorption.
  • One of the main embedded solutions with Lumerical DGTD is the impact of replacement, which determines the optical loss in the mid-infrared.
  • Engineers can discover impressive low-loss performance advantages from blue-shifted interband transitions and minimum FCA through proper deployment, which is supported by linked first-principle modeling and experimental characterization.
  • Utilizing the exceptional optical features of this innovative solution provided by DGTD, record low losses in non-volatile photonic circuits and electrical pixelated switching can be identified.
  • Lumerical DGTD offers a flexible visual database, with multi-coefficient broadband optical material models and scriptable material properties.


Ansys Lumerical DGTD (Discontinuous Galerkin Time Domain) In-Action

Supporting Ansys Lumerical DGTD video materials showcasing  functionality, and practical industrial application.

Accuracy and Performance Tips in Ansys Lumerical DGTD
Differences between the Lumerical DGTD and FDTD Solvers





  • High Order Mesh Polynomials
  • Transitional 2D & 3D Modeling
  • Far-field and Grating Projections






Ansys Lumerical Products

Designers can model interacting optical, electrical, and thermal effects thanks to tools that seamlessly integrate device and system level functionality. A variety of processes that combine device multiphysics and photonic circuit simulation with external design automation and productivity tools are made possible by flexible interoperability between products.



Ansys Lumerical MODE

Optical Waveguide & Coupler Solver



Ansys Lumerical FDTD

Simulation of Nanophotonic Devices




Photonic Integrated Circuit Simulator







Ansys Lumerical CHARGE

3D Charge Transport Solver



Ansys Lumerical HEAT

3D Heat Transport Solver


Ansys Lumerical DGTD

3D Electromagnetic (EM) Simulator







Ansys Lumerical FEEM

Finite Element Waveguide Simulation

Ansys Lumerical FEEM


Ansys Lumerical MQW

Quantum Well Gain Simulation



Ansys Lumerical STACK

Optical Thin-Film Simulation