Abstract
Based on the metasurface composed with sub-wavelength antennas, two terahertz (THz) polarization devices are proposed and experimentally demonstrated. The THz polarization modulator is used to tune the amplitude and phase difference of the two orthogonal electric components, thus to modulate the polarization of the transmitted THz beam. The linear-to-linear and linear-to-elliptical polarization conversion is realized. The spin selected THz metasurface lens can focus the light with different spin states on two different points on the preset plane and perform the spin selected imaging according to the polarization of the illuminating light.
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