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WKB approach to evaluate series of Mathieu functions in scattering problems

Hubert, Maxime ; Dubertrand, Rémy


The scattering of a wave obeying Helmholtz equation by an elliptic obstacle can be described exactly using series of Mathieu functions. This situation is relevant in optics, quantum mechanics and fluid dynamics. We focus on the case when the wavelength is comparable to the obstacle size, when the most standard approximations fail. The approximations of the radial (or modified) Mathieu functions ...


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