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The simulated (red line) and measured (blue line) results of the polarization-independent broadband THz absorber with (a) TE incident THz wave, and (b) TM incident THz wave. (c) The calculated reflection spectrum in the case of that the periodical array on top of the substrate is equivalent as an effective medium. (d) The diffraction efficiency (DE) of different diffraction orders. The inset in (a) is the quality factor of such periodical structure.
