Continuous-discontinuous Galerkin time domain (CDGTD) method with generalized dispersive material (GDM) model for...

Area of Science:

• Computational electromagnetics
• Nanophotonics simulation

Background:

• The continuous-discontinuous Galerkin time domain (CDGTD) method excels in radio frequency (RF) and microwave (MW) simulations, handling multiscale problems efficiently.
• Nanophotonics requires accurate modeling of dispersive materials, which poses challenges for existing simulation methods.

Purpose of the Study:

• To extend the CDGTD method for nanophotonics applications.
• To incorporate a generalized dispersive material (GDM) model for accurate simulation of optical dispersion.

Main Methods:

• Developed a CDGTD method integrated with a universal GDM model.
• The GDM model efficiently implements various optical dispersion models (Drude, Debye, Lorentz, etc.).
• Leveraged CDGTD advantages: domain decomposition, non-conformal meshing, high-order elements, and hp-refinement.

Main Results:

• Validated the accuracy and convergence of the GDM-incorporated CDGTD method through numerical examples.
• Demonstrated the method's capability to handle diverse optical materials, including plasmonic and tunable elements.

Conclusions:

• The GDM-enhanced CDGTD method is suitable for nanophotonics simulations.
• This approach enables efficient design and optimization of large-scale photonic devices with complex dispersive materials.