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We propose and demonstrate a modulatable all-silicon terahertz absorber based on a cylindrical metamaterial structure. Broadband absorption is obtained from 0.86 to 2.00 THz, with an average absorbance of 94%, indicating a wide absorption bandwidth of 1.14 THz. The maximum absorption, around 1.24 THz, is up to 98%. We employ simulation results to investigate the physical properties of the absorption, and we attribute the broadband absorption to a combination of electric dipole and magnetic dipole modes. Furthermore, the tunable response
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