期刊
ADVANCED MATERIALS
卷 32, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201903983
关键词
high-capacity photonics; metasurfaces; vector vortex beams; wavefront shaping
类别
资金
- Fundamental Research Funds for Central Universities [2242017R30003]
- Natural Science Foundation of China (NSFC) [61801109, 61627801, 11874102]
- Natural Science Foundation of Jiangsu Province [BK20170687]
- Penn State University John L. and Genevieve H. McCain endowed chair professorship
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program (CRP award) [NRF-CRP15-2015-03]
- Ministry of Education via RSB, Singapore [C-261-000-207-532, C-261-000-777-532]
Cylindrical vector vortex beams, a particular class of higher-order Poincare sphere beams, are generalized forms of waves carrying orbital angular momentum with inhomogeneous states-of-polarization on their wavefronts. Conventional methods as well as the more recently proposed segmented/interleaved shared-aperture metasurfaces for vortex beam generation are either severely limited by bulky optical setups or by restricted channel capacity with low efficiency and mode number. Here, a noninterleaved vortex multiplexing approach is proposed, which utilizes superimposed scattered waves with opposite spin states emanating from all meta-atoms in a coherent manner, counter-intuitively enabling ultrahigh-capacity, high-efficiency, and flexible generation of massive vortex beams with structured state-of-polarization. A series of exemplary prototypes, implemented by sub-wavelength-thick metasurfaces, are demonstrated experimentally, achieving kaleidoscopic vector vortex beams. This methodology holds great promise for structured wavefront shaping, vortex generation, and high information-capacity planar photonics, which may have a profound impact on transformative technological advances in fields including spin-Hall photonics, optical holography, compressive imaging, electromagnetic communication, and so on.
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