Nonreciprocal Wavefront Manipulation in Synthetically Moving Metagratings
Younes Ra’di, Andrea Alù
Abstract
We introduce a metasurface platform for nonreciprocal wave manipulation. We study metagratings composed of nonreciprocal bianisotropic particles supporting synthetic motion, which enable nonreciprocal energy transfer between tailored Floquet channels with unitary efficiency. Based on this framework, we derive the required electromagnetic polarizabilities to realize a metagrating supporting space wave circulation with unitary efficiency for free-space radiation and design a microwave metagrating supporting this functionality. The proposed concept opens new research venues to control free-space radiation with high efficiency beyond the limits dictated by Lorentz reciprocity.
Topics & Concepts
WavefrontLorentz transformationMicrowavePhysicsReciprocity (cultural anthropology)Unitary stateFloquet theoryElectromagnetic radiationSpace (punctuation)Computer scienceOpticsClassical mechanicsQuantum mechanicsOperating systemPsychologyNonlinear systemSocial psychologyPolitical scienceLawMetamaterials and Metasurfaces ApplicationsAdvanced Antenna and Metasurface TechnologiesAntenna Design and Analysis