Abstract
We present a terahertz wave dual-band polarization converter with near-perfect asymmetric transmission (AT) performance based on anisotropic metamaterial that is composed of a bi-layered subwavelength metal grating sandwiched with symmetrical dual radar structure array. It can achieve high efficiency dual-band polarization conversion and high efficiency AT performance in terahertz region. The results show that the polarization conversion rate (PCR) of the terahertz wave exceeds 99% under the forward (-z)/backward (+z) direction incidence in two terahertz bands from 0.38 THz to 1.34 THz and from 1.40 THz to 2.23 THz with a relative bandwidth of 111.63% and 45.73% respectively. The corresponding AT performance in excess of 0.8 is from 0.60 THz to 1.12 THz and from 1.61 THz to 1.98 THz with a relative bandwidth of 60.47% and 20.61% respectively. Due to the excellent charming performance, the proposed structure has great application potential in terahertz isolator.
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