Fig. 4: The optimization of nanopillar parameters for achieving high-efficiency broadband metasurface.
From: Dynamic 3D metasurface holography via cascaded polymer dispersed liquid crystal
a The 3D illustration of a single unit cell (P) exhibiting a rectangular nanopillar with dimensions of width (x), length (y), and height (H) coated on a transparent thick SiO2 film. b Aerial-view SEM image of the broadband metasurface. c Cross-polarization transmittance (cr-transmittance) of the α-Si based nanopillar structure with optimized parameters. d Simulation graph of the cr-transmittance of a rectangular nanopillar with different length-width ratio at the optical wavelength of 635 nm and e of height changing of nanopillar at different wavelengths from 450 nm to 850 nm. f Phase generated by nanopillar at different angles under wavelengths of 450-850 nm
