Nonreciprocalwavefront manipulation in synthetically moving metagratings

Younes Ra'di, Andrea Alù

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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.

Original languageEnglish (US)
Article number28
Issue number2
StatePublished - Jun 1 2020
Externally publishedYes


  • Bianisotropy
  • Metagrating
  • Metasurface
  • Nonreciprocity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Radiology Nuclear Medicine and imaging


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