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We demonstrate a metamaterials-based THz broadband polarization rotator which is able to rotate linearly polarized THz wave by 90 degree within a wide frequency range (0.44 to 0.76 THz). The device is characterized both theoretically and experimentally. Analyses show that the multiple-plasmon-resonance is the key for the broadband feature and the phase-shift difference of the two reflection components is critical for the polarization conversion. The approach demonstrated in the work can be useful for constructing building blocks for THz polarimetry.

Broadband THz reflective polarization rotator by multiple plasmon resonances