4.6 Article

Broadband and high-efficiency spin-polarized wave engineering with PB metasurfaces

Journal

OPTICS EXPRESS
Volume 28, Issue 10, Pages 15601-15610

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OE.394658

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Funding

  1. National Natural Science Foundation of China [11874118, 11674068, 11734007, 91850101]
  2. National Key Research and Development Program of China [2017YFA0303500, 2017YFA0700201]
  3. Science and Technology Commission of Shanghai Municipality [18ZR1403400]

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Manipulating circularly polarized (CP) light waves at will are highly important for photonic researches and applications. Recently, while Pancharatnam-Berry (PB) metasurfaces have shown unprecedented capabilities to control CP light, meta-devices constructed so far always suffer from the limitations of low-efficiency and narrow bandwidth. Here, we propose a scheme to construct PB metasurfaces with these two issues well addressed. To verify our idea, two PB meta-devices are designed and fabricated for achieving high-efficiency and broadband photonic spin Hall effect and focusing effect, respectively. Experimental results, in good agreement with full wave simulations, demonstrate the desired functionalities with efficiencies reaching 80% within an ultra-wide frequency band (8.2-17.3GHz). The proposed design scheme is generic and can be extended to high-frequency regimes. Our work can stimulate the realizations of high-performance and broadband PB meta-devices with diversified functionalities. (c) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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