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High-Efficiency and Broadband Near-Infrared Bi-Functional Metasurface Based on Rotary Different-Size Silicon Nanobricks

1
Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2
School of Electrical Engineering and Intelligentization, Dongguan University of Technology, Dongguan 523808, China
3
School of Science, Jiangnan University, Wuxi 214122, China
4
School of Computer and Information, Hefei University of Technology, Hefei 230009, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1744; https://doi.org/10.3390/nano9121744
Received: 28 September 2019 / Revised: 30 November 2019 / Accepted: 3 December 2019 / Published: 7 December 2019
Several novel spin-dependent bi-functional metasurfaces consisting of different-sized rotary silicon nanobricks have been proposed and numerically investigated based on the Pancharatnam–Berry phase and structural phase simultaneously. Here, a transmission mechanism is strictly deduced, which can avoid crosstalk from the multiplexed bi-functional metasurface. Four kinds of high-efficiency bi-functional devices have been designed successfully at infrared wavelengths, including a spin-dependent bi-functional beam deflector, a spin-dependent bi-functional metalens, a bi-functional metasurface with spin-dependent focusing and deflection function, and a spin-dependent bi-functional vortex phase plate. All of the results demonstrate the superior performances of our designed devices. Our work opens up new doors toward building novel spin-dependent bi-functional metasurfaces, and promotes the development of bi-functional devices and spin-controlled photonics. View Full-Text
Keywords: metasurface; phase modulation; vortex beam; metalens metasurface; phase modulation; vortex beam; metalens
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Wang, W.; Guo, C.; Tang, J.; Zhao, Z.; Wang, J.; Sun, J.; Shen, F.; Guo, K.; Guo, Z. High-Efficiency and Broadband Near-Infrared Bi-Functional Metasurface Based on Rotary Different-Size Silicon Nanobricks. Nanomaterials 2019, 9, 1744.

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