研究目的
Investigating the design and performance of high-efficiency and broadband near-infrared bi-functional metasurfaces based on rotary different-size silicon nanobricks for integrated optics and spin-controlled photonics applications.
研究成果
The study successfully demonstrates the design of high-efficiency and broadband spin-dependent bi-functional metasurfaces in the near-infrared band. These metasurfaces, based on rotary silicon nanobricks, exhibit superior performance in beam deflection, focusing, and vortex beam generation, with potential applications in integrated optics and spin-controlled photonics.
研究不足
The study is limited to numerical simulations and does not include experimental validation. The broadband characteristics are evaluated within the near-infrared band (1200–1700 nm), and the performance may vary outside this range.
1：Experimental Design and Method Selection:
The study employs the finite-difference time-domain (FDTD) method with periodic boundary conditions to design and verify the metasurfaces. The phase accumulation is achieved through the waveguide effect related to the height of the rotary silicon nanobricks (RSNs).
2：Sample Selection and Data Sources:
The metasurfaces are composed of RSNs with varying lengths, widths, and orientations, adhered onto SiO2 substrate. The complex permittivity of silicon is extracted from Pierce's data.
3：List of Experimental Equipment and Materials:
The study uses RSNs with specific dimensions and orientations, and SiO2 substrate. The height of the RSNs is optimized to 900 nm for achieving the entire 2π phase under incident light with a wavelength of 1500 nm.
4：Experimental Procedures and Operational Workflow:
The study involves designing four kinds of bi-functional metasurfaces: a beam deflector, a metalens, a metasurface with focusing and deflection functions, and a vortex phase plate. The performance of these devices is evaluated through numerical simulations.
5：Data Analysis Methods:
The performance of the designed metasurfaces is analyzed based on their efficiency, focusing quality, deflection angles, and broadband characteristics.
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