RECIPROCITY THEOREM FOR CORRUGATED SURFACES USED IN CONICAL DIFFRACTION MOUNTINGS

The reciprocity theorem, well known for gratings used in classical diffraction, is generalized to the case where the incident wave propagates outside the cross-section plane of the grating (conical diffraction). The authors establish relations on the components of the electric and magnetic fields, for dielectric or conducting periodic structures utilized either in reflexion or in transmission. Symmetry properties of the scattering matrix are derived, from which relations on the efficiencies in natural light are established. All the relations are illustrated by numerical computations based on the electromagnetic theory of gratings. © 1979 Taylor & Francis Group, LLC.