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Space-time gradient metasurfaces
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DOI：10.1103/PhysRevB.92.100304.png)
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Abstract
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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.
Keywords:
ELECTROMAGNETIC-FIELDS
NON-RECIPROCITY
WAVE-FRONT
LIGHT
SURFACE
REFLECTION
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