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Plane Wave Spectrum (PWS) Method
The Plane Wave Spectrum (PWS) method is a well known and efficient
technique for calculating the propagation of electromagnetic (EM)
waves. Its efficiency lies in the ability to propagate EM waves
from one plane to another using fast Fourier transforms (FFTs).
In recent years the PWS has been used in combination with two-dimensional
computational
electromagnetic (CEM) methods to more efficiently perform
the rigorous
analysis of diffractive
optical elements (DOEs).
Whereas CEM methods solve the EM boundary value problem without
approximation, they typically require significant computational
resources. To this end, the computational region is often limited
to that just surrounding the DOE boundary and more efficient methods,
such as the PWS, are used to propagate the near-fields to the
plane of observation.
Example
of dispersion surfaces (avi)
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