期刊
NANOPHOTONICS
卷 11, 期 9, 页码 2025-2036出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2022-0006
关键词
far-field wavefront; metasurface; Pancharatnam-Berry phase; propagation wave; surface wave
资金
- National Key Research and Development Program of China [2020YFA0710100, 2017YFA0303504]
- National Natural Science Foundation of China [11874118, 91850101, 11734007, 62192771]
- Shanghai Science and Technology Committee [20JC1414601]
- Fudan UniversityCIOMP Joint Fund [FC2018-008]
A new strategy is proposed to efficiently generate arbitrary spin-polarized scattering far-field patterns from surface-wave (SW) excitations on a designer Pancharatnam-Berry (PB) metasurface. PB meta-atoms serve as subwavelength scatter to decouple impinging SW to spin-polarized propagating waves (PW), and interference among PWs generated by scatterings at different PB meta-atoms can generate tailored far-field patterns. Designed PB metasurfaces in the microwave regime can generate desired radiation patterns within a broad frequency band, including unidirectional radiation, line/point focusing, vortex beam, and hologram.
Achieving a pre-designed scattering pattern from an ultra-compact platform is highly desired for on-chip integration optics, but conventional techniques suffer from the limitations of bulky size, wavelength-scale modulation and low efficiency. Here, we propose a new strategy to efficiently generate arbitrary spin-polarized scattering far-field patterns from surface-wave (SW) excitations on a designer Pancharatnam-Berry (PB) metasurface. We find that a PB meta-atom serves as a subwavelength scatter to decouple impinging SW to a spin-polarized propagating wave (PW) with tailored amplitude and phase, and thus interference among PWs generated by scatterings at different PB meta-atoms can generate a tailored far-field pattern. As a proof of concept, we design and fabricate a series of PB metasurfaces in the microwave regime and experimentally demonstrate that they can generate desired radiation patterns within a broad frequency band, including unidirectional radiation, line/point focusing, vortex beam and hologram. These findings may stimulate important applications in on-chip integrated photonics.
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