Large-Scale Metasurface Simulation Using Local-Segmented Approach.

Area of Science:

• Electromagnetism
• Nanophotonics
• Computational Physics

Background:

• Electromagnetic couplings between nanostructures complicate metasurface design and simulation.
• Conventional simulations often neglect these crucial coupling effects, leading to inaccuracies, especially for large-scale metasurfaces.

Purpose of the Study:

• To introduce a novel computational framework that accurately incorporates electromagnetic coupling effects between meta-atoms in metasurfaces.
• To enable efficient and precise simulation of entire metasurfaces, including large-scale and aperiodic elements.

Main Methods:

• Decomposition of the incident electromagnetic field.
• Segmentation of the computational domain for localized, parallel simulations.
• Inclusion of inter-element electromagnetic coupling effects within the framework.

Main Results:

• The proposed framework significantly reduces deviation from rigorous simulation methods (up to 97% reduction).
• Achieved computation times are substantially faster than rigorous methods (10x and 4x speedup for tested examples).
• Demonstrated accuracy and efficiency on a cylindrical metalens and an aperiodic beam splitter.

Conclusions:

• The developed computational framework offers an effective and accurate solution for simulating metasurfaces with complex electromagnetic couplings.
• This approach overcomes limitations of conventional methods, paving the way for advanced metasurface design and application.