A Terahertz Tunable Metamaterial Reflective Polarization Converter Based On Vanadium Oxide Film

In this paper, on the basis of metamaterial, a simply single-layer and tunable reflective polarization converter has been numerically investigated, which is composed of vanadium dioxide film (VO2) component combined with two-corner-cut square patch cut by a slit and reflective ground layer. Calculated results obtained by the CST Microwave Studio show that in the frequency of 2.22-5.42 THz, high polarization conversion efficiency (polarization conversion ratio (PCR) above 90%) can be normally achieved at the temperature about 25 degrees C for both the linearly and circularly polarized wave incidence. At the same time, the cross-polarization converter can be analyzed and obtained from the view on qualitative variable of polarization azimuth angle (theta) and ellipticity (eta). Moreover, a tunable polarization conversion property can be realized by the designed device with vanadium dioxide utilizing changing different conductivities. Even so, to be demonstrated, the physical mechanism of the merits of controllability and uniqueness has been discussed by the distributions of current densities and E-field map, respectively. According to the prior results, the designed metamaterial could be applied in the area of temperature-controlled sensing, THz wireless communication, tunable polarized devices.