= Plane wave expansion method
{wiki=Plane_wave_expansion_method}
The Plane Wave Expansion (PWE) method is a mathematical technique often used in the fields of electromagnetics, photonics, and solid-state physics to solve wave propagation problems in periodic structures. This method is particularly useful for analyzing structures such as photonic crystals, diffraction gratings, and resonant cavities. \#\#\# Key Concepts of the Plane Wave Expansion Method: 1. **Periodic Structures**: PWE is best suited for systems that exhibit periodicity in one or more dimensions.
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