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Highly efficient vortex generation at the nanoscale
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DOI：10.1038/s41565-024-01636-y.png)
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Control of the angular momentum of light at the nanoscale is critical for many applications of subwavelength photonics, such as high-capacity optical communications devices, super-resolution imaging and optical trapping. However, conventional approaches to generate optical vortices suffer from either low efficiency or relatively large device footprints. Here we show a new strategy for vortex generation at the nanoscale that surpasses single-pixel phase control. We reveal that interaction between neighbouring nanopillars of a meta-quadrumer can tailor both the intensity and phase of the transmitted light. Consequently, a subwavelength nanopillar quadrumer is sufficient to cover a 2l pi phase change, thus efficiently converting incident light into high-purity optical vortices with different topological charges l. Benefiting from the nanoscale footprint of the meta-quadrumers, we demonstrate high-density vortex beam arrays and high-dimensional information encryption, bringing a new degree of freedom to many designs of meta-devices. A metasurface consisting of merely four nanopillars at the wavelength scale is sufficient to generate a high-quality vortex beam.
Keyword:
ORBITAL ANGULAR-MOMENTUM
METASURFACES
BEAMS
BREAKING
LIGHT
期刊
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34.9
论文数:
4.8K
被引数:
8.1W
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