Facile metagrating holograms with broadband and extreme angle tolerance

The emerging meta-holograms rely on arrays of intractable meta-atoms with various geometries and sizes for customized phase profiles that can precisely modulate the phase of a wavefront at an optimal incident angle for given wavelengths. The stringent and band-limited angle tolerance remains a funda...

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Bibliographic Details
Published in:Light, science & applications science & applications, 2018-10, Vol.7 (1), p.78-8, Article 78
Main Authors: Deng, Zi-Lan, Deng, Junhong, Zhuang, Xin, Wang, Shuai, Shi, Tan, Wang, Guo Ping, Wang, Yao, Xu, Jian, Cao, Yaoyu, Wang, Xiaolei, Cheng, Xing, Li, Guixin, Li, Xiangping
Format: Article
Language:English
Subjects:
Optics
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Summary:The emerging meta-holograms rely on arrays of intractable meta-atoms with various geometries and sizes for customized phase profiles that can precisely modulate the phase of a wavefront at an optimal incident angle for given wavelengths. The stringent and band-limited angle tolerance remains a fundamental obstacle for their practical application, in addition to high fabrication precision demands. Utilizing a different design principle, we determined that facile metagrating holograms based on extraordinary optical diffraction can allow the molding of arbitrary wavefronts with extreme angle tolerances (near-grazing incidence) in the visible-near-infrared regime. By modulating the displacements between uniformly sized meta-atoms rather than the geometrical parameters, the metagratings produce a robust detour phase profile that is irrespective of the wavelength or incident angle. The demonstration of high-fidelity meta-holograms and in-site polarization multiplexing significantly simplifies the metasurface design and lowers the fabrication demand, thereby opening new routes for flat optics with high performances and improved practicality.
ISSN:2047-7538
2095-5545
2047-7538
DOI:10.1038/s41377-018-0075-0