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

Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
School of Electrical Engineering and Intelligentization, Dongguan University of Technology, Dongguan 523808, China
School of Science, Jiangnan University, Wuxi 214122, China
School of Computer and Information, Hefei University of Technology, Hefei 230009, China
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1744;
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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