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(a) Phase profile when nanoparticle width is sweeped inside one periodicity for a three-block discretized metasurface. Si and SiO2 are used for making the metasurface. Sketch in the right shows the geometry of the discretized metasurfaces. (b) When the frequency is set at 400 THz, absorption has a similar value as in the case of ideal metasurfaces. Both cases are better than in the case with no metasurface. The right panel shows the scattered E-field profiles, confirming large light trapping.
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