Inhomogeneous plane-wave spectrum based Physical Optics

The Physical Optics aperture radiation is decomposed into an inhomogeneous plane-wave spectrum, for which a sub-nyquist sampling is achieved, despite a 2-digits accuracy. Validation with a Hertzian dipole and observations are made for large planar surfaces. The Spectral Physical Optics (SPO) seems particularly well-suited for multiple interactions between large facets in complex scattering environnements.