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Terahertz (THz) wave has numerous applications due to its capabilities of penetrating many materials such as plastic,clothes,woods,ceramic,rubber and so on,and characteristic spectra of chemicals,drugs,and explosives et al..Especially it doesnt cause damage to biological samples because of its low photon energy.As a result,it has a promising application in biomedical detection technologies.Here,we report a new broadband THz polarizer,that could be applied in THz biological imaging.