Diffraction of plane waves from a strip grating on a ferrite substrate

Abstract

Diffraction of plane waves from a strip grating deposited on a magnetized ferrite substrate is studied analytically, with the incident electric field and biasing magnetic field assumed to be parallel to the edges of the strips, since the incident wave in these circumstances excites magnetostatic surface waves most strongly. Analytical complexity is concisely reduced to a nonreciprocal Riemann–Hilbert problem that is solved in a rigorous manner for an arbitrary incident angle. The numerical results show that a large number of scattering resonances occur in the short-wavelength range owing to magnetostatic surface waves excited in the ferrite. The characteristics obtained here are asymmetric in the sense that the distribution of the scattering resonances is dependent on the sign of the incidence angle. For normal incidence, the asymmetry shows that the intensity of the reflected beam depends on the sign of its angle. © 1999 Scripta Technica, Electron Comm Jpn Pt 2, 82(7): 41–49, 1999