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Exploiting the Properties of Metagratings for Designing Rectangular Waveguide Mode Converters

We explore the potential of metagrating for designing rectangular waveguide (RWG) TE10-to-TE20 mode converters via detailed analytical modelling. Such converters find their significance in applications like power combiners [1] and mode division multiplexers. Metagratings, on the other hand, are periodic arrays of polarizable particles (meta-atoms), capable of maneuvering electromagnetic wavefronts efficiently for advanced beam manipulation applications, such as beam splitting, and anomalous reflection and refraction [2]–[3]. This is achieved by tailoring the configuration's degree of freedom such that energy is funneled exclusively to the desirable Floquet-Bloch (FB) modes, while quenching undesired FB channels by destructive interference.