Broadband asymmetric light transmission via all-dielectric digital metasurfaces

被引：41

作者：

Shen, Bing ^{[1
]}

Polson, Randy ^{[2
]}

Menon, Rajesh ^{[1
]}

机构：

[1] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA

[2] Univ Utah, Utah Nanofabricat Facil, Salt Lake City, UT 84112 USA

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 16期

基金：

美国国家航空航天局;

关键词：

NANOSTRUCTURES; PHOTOVOLTAICS; METAMATERIAL; OPTIMIZATION; REFRACTION; RADIATION; DENSITY; SPACE; FILM;

D O I：

10.1364/OE.23.020961

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate broadband asymmetric transmission or optical-diode behavior via a digital metasurface, that is, a surface that is digitally patterned at subwavelength dimensions. Enhanced light-matter interactions at the interfaces of the metasurface break the symmetry in the propagation direction, and enables high light-transmission in one direction, while strongly reflecting the light in the opposite direction. We measured a peak extinction ratio of 11.18 dB and peak forward transmission efficiency of 74.3% at the design wavelength of 1.55 mu m. The operational bandwidth of the device was 201 nm. We further designed, fabricated and experimentally characterized a digital metasurface that enables polarization-independent optical-diode behavior, which we believe is the first device of its kind. Our digital metasurfaces enable the optical-diode behavior in a single layer of sub-wavelength thickness for several input modes and therefore, can perform as a passive, albeit imperfect optical isolator. (C) 2015 Optical Society of America

引用

页码：20961 / 20970

页数：10

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