The connection between anisotropic metasurfaces and the original CROW concept. (IMAGE)
Caption
The connection between anisotropic metasurfaces and the original CROW concept. (a) Schematic illustration of a 1D array of microcavities supporting the CROW effect. The disks labeled with numbers represent n high-Q resonators, with coupling strength between them that is inversely proportional to the period a. (b) Schematic of a sawtooth-shaped anisotropic metasurface with periodic perturbation along the y-direction (top) and the electric field distribution of the supported CROW mode (bottom). Each corrugated waveguide corresponds to one microcavity in (a). (c) and (d) present the calculated band structures and corresponding group velocities across the full kx space for the structure in (a) with a = 300 nm, 400 nm, and 850 nm, respectively. λ0 represents the resonant wavelength. (e) Structural design of various anisotropic metasurfaces which support the CROW-based flatband responses with different polarization characteristics and flatband dimensions.
Credit
K. Sun et al., doi 10.1117/1.AP.7.5.056008.
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