Space-time gradient metasurfaces

被引：331

作者：

Hadad, Y. ^{[1
]}

Sounas, D. L. ^{[1
]}

Alu, A. ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78701 USA

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 10期

关键词：

ELECTROMAGNETIC-FIELDS; NON-RECIPROCITY; WAVE-FRONT; LIGHT; SURFACE; REFLECTION;

D O I：

10.1103/PhysRevB.92.100304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：6

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