Complex-amplitude metasurface-based orbital angular momentum holography in momentum space

被引：651

作者：

Ren, Haoran ^{[1
]}

Fang, Xinyuan ^{[2
]}

Jang, Jaehyuck ^{[3
]}

Buerger, Johannes ^{[1
]}

Rho, Junsuk ^{[3
,4
]}

Maier, Stefan A. ^{[1
,5
]}

机构：

[1] Ludwig Maximilians Univ Munchen, Chair Hybrid Nanosyst, Nanoinst Munich, Fac Phys, Munich, Germany

[2] Univ Shanghai Sci & Technol, Sch Opt Elect & Comp Engn, Ctr Artificial Intelligence Nanophoton, Shanghai, Peoples R China

[3] Pohang Univ Sci & Technol POSTECH, Dept Chem Engn, Pohang, South Korea

[4] Pohang Univ Sci & Technol POSTECH, Dept Mech Engn, Pohang, South Korea

[5] Imperial Coll London, Dept Phys, London, England

来源：

NATURE NANOTECHNOLOGY | 2020年 / 15卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

DIELECTRIC METASURFACES; PHASE; ENTANGLEMENT; POLARIZATION;

D O I：

10.1038/s41565-020-0768-4

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Digital optical holograms can achieve nanometre-scale resolution as a result of recent advances in metasurface technologies. This has raised hopes for applications in data encryption, data storage, information processing and displays. However, the hologram bandwidth has remained too low for any practical use. To overcome this limitation, information can be stored in the orbital angular momentum of light, as this degree of freedom has an unbounded set of orthogonal helical modes that could function as information channels. Thus far, orbital angular momentum holography has been achieved using phase-only metasurfaces, which, however, are marred by channel crosstalk. As a result, multiplex information from only four channels has been demonstrated. Here, we demonstrate an orbital angular momentum holography technology that is capable of multiplexing up to 200 independent orbital angular momentum channels. This has been achieved by designing a complex-amplitude metasurface in momentum space capable of complete and independent amplitude and phase manipulation. Information was then extracted by Fourier transform using different orbital angular momentum modes of light, allowing lensless reconstruction and holographic videos to be displayed. Our metasurface can be three-dimensionally printed in a polymer matrix on SiO(2)for large-area fabrication. A complex-amplitude metasurface hologram is conceptually designed and three-dimensionally printed. The device allows for high-bandwidth orbital angular momentum multiplexing holography and holographic video displays.

引用

页码：948 / +

页数：9

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