Meng-Qiang Zou, Huan Liu, Yi Gong, Ya-Xian Fan, Zhi-Yong Tao,
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11196/111960L/An-efficient-terahertz-metamaterial-linear-polarization-converter/10.1117/12.2538629.short
An efficient terahertz (THz) metamaterial linear
polarization converter is proposed. The structure consists of three layers of
metal-dielectric-metal, including an anisotropic super-surface based on
bimetallic arc structure as the top layer and a dielectric layer and a metal
plate as middle layer and bottom layer, separately. The numerical analysis
results show that broadband polarization conversion of a linearly polarized
wave in the terahertz band is realized using the structure proposed. The
polarization conversion ratio of the linearly polarized wave is more than 90%
across a wide frequency range from 1.21 THz to 2.82 THz. The ratio of bandwidth
to central frequency can reach 80%. The mechanism of high polarization
conversion rate and broadband is analyzed. At the same time, the dependence of
the polarization conversion rate of the structure on the incident angle is
studied. The results show that the structure has good polarization conversion
performance in the incident angle range of 0-60°. Compared with previous
designs, the polarization converter has not only simple structure, but also
wide bandwidth. It has potential application value in polarization modulation
of terahertz wave.
