Figure | Working principle of the folded-path metasurface. (IMAGE)
Caption
Figure | Working principle of the folded-path metasurface. a, Schematic of a folded-path metasurface that can achromatically deflect and focus broadband light for two orthogonal polarization (or spin) states independently. Polarization-dependent local interference leads to different light paths for incident light with orthogonal polarization states. b, Diagram of metasurface array (red dashed box) consisting of four anisotropic nanopillars. c, Comparison of the phase spectra obtained from the multiple reflection model and full-wave simulation, verifying the tunability of dispersion based on the phase differences between subcells A and B. d-f, Phase spectra for different orthogonal polarization combinations. Blue and red curves indicate the results for two orthogonal polarization states. Solid and dashed curves correspond to the results obtained by two different supercells shown in the inset.
Credit
Fei Zhang, Hanlin Bao et al.
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