Reflective gradient metasurfaces for polarization-independent light   focusing at normal or oblique incidence

doi:10.1063/1.4942465

CORC > 北京大学 > 信息科学技术学院

	Reflective gradient metasurfaces for polarization-independent light focusing at normal or oblique incidence
	Ma, Wei ; Jia, Delin ; Yu, Xiaomei ; Feng, Yun ; Zhao, Yuejin
刊名	APPLIED PHYSICS LETTERS
	2016
关键词	BROAD-BAND PLASMONIC METASURFACES WAVE PLATES LENS EFFICIENT INDEX WAVELENGTHS REFRACTION
DOI	10.1063/1.4942465
英文摘要	Reflective gradient metasurfaces are reported as flat, ultra-thin light focusers using a cross-resonator array with spatially varied geometric parameters atop a continuous gold ground plane spaced by a layer of SiO2. The sub-wavelength cross-shaped building element offers polarization-independent performance and full 2 pi phase tuning range by varying its width and length, which is explained by an analytical model based on harmonically oscillating dipole antenna. With a radial phase gradient, a metasurface is demonstrated to function as a parabolic reflector at 1.47 mu m wavelength with the measured efficiency of 44%. In addition, by elaborately engineering the planar distribution of different building elements, another two focusing reflectors are designed and experimentally verified to anomalously reflect and concentrate light along normal direction but with oblique incident angles of 30 degrees and 60 degrees, respectively. (C) 2016 AIP Publishing LLC.; National Natural Science Foundation of China [61275104, 61575003]; SCI(E); EI; ARTICLE; yuxm@pku.edu.cn; 7; 108
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437679]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Ma, Wei,Jia, Delin,Yu, Xiaomei,et al. Reflective gradient metasurfaces for polarization-independent light focusing at normal or oblique incidence[J]. APPLIED PHYSICS LETTERS,2016.
APA	Ma, Wei,Jia, Delin,Yu, Xiaomei,Feng, Yun,&Zhao, Yuejin.(2016).Reflective gradient metasurfaces for polarization-independent light focusing at normal or oblique incidence.APPLIED PHYSICS LETTERS.
MLA	Ma, Wei,et al."Reflective gradient metasurfaces for polarization-independent light focusing at normal or oblique incidence".APPLIED PHYSICS LETTERS (2016).