Nonlocal Metasurfaces for Optical Signal Processing

被引：343

作者：

Kwon, Hoyeong ^{[1
]}

Sounas, Dimitrios ^{[1
]}

Cordaro, Andrea ^{[2
,3
]}

Polman, Albert ^{[3
]}

Alu, Andrea ^{[1
,4
,5
,6
]}

机构：

[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA

[2] Univ Amsterdam, Inst Phys, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[3] AMOLF, Ctr Nanophoton, Sci Pk 104, NL-1098 XG Amsterdam, Netherlands

[4] CUNY, Adv Sci Res Ctr, Photon Initiat, New York, NY 10031 USA

[5] CUNY, Grad Ctr, Phys Program, New York, NY 10016 USA

[6] CUNY, City Coll, Dept Elect Engn, New York, NY 10031 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 17期

基金：

美国国家科学基金会;

关键词：

REFLECTION;

D O I：

10.1103/PhysRevLett.121.173004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Optical analog signal processing has been gaining significant attention as a way to overcome the speed and energy limitations of digital techniques. Metasurfaces offer a promising avenue towards this goal due to their efficient manipulation of optical signals over deeply subwavelength volumes. To date, metasurfaces have been proposed to transform signals in the spatial domain, e.g., for beam steering, focusing, or holography, for which angular-dependent responses, or nonlocality, are unwanted features that must be avoided or mitigated. Here, we show that the metasurface nonlocality can be engineered to enable signal manipulation in the momentum domain over an ultrathin platform. We explore nonlocal metasurfaces performing basic mathematical operations, paving the way towards fast and power-efficient ultrathin devices for edge detection and optical image processing.

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