Space-time gradient metasurfaces

Y. Hadad, D. L. Sounas, A. Alu

Research output: Contribution to journalArticlepeer-review


Metasurfaces characterized by a transverse gradient of local impedance have recently opened exciting directions for light manipulation at the subwavelength scale. Here we add a temporal gradient to the picture, showing that spatiotemporal variations over a surface may greatly extend the degree of wave manipulation in metasurfaces, and break several of their constraints associated with symmetries. As an example, we synthesize a nonreciprocal classical analog to electromagnetically induced transparency, opening a narrow window of one-way efficient transmission in an otherwise opaque surface. These properties pave the way to magnetic-free, planarized, nonreciprocal ultrathin surfaces for free-space isolation.

Original languageEnglish
Article number100304
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
StatePublished - 22 Sep 2015
Externally publishedYes


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