Fig. 1. Schematic of the unit structure of polarization converter

Fig. 2. (a) Reflectivity; (b) polarization conversion rate; (c) reflection phase difference of polarization converter

Fig. 3. (a) Definition of u-v axis; (b) reflectivity of cross-polarization, (c) reflectivity of co-polarization and (d) reflection phase difference of co-polarization of electric field along u-v axis

Fig. 4. Distributions of current on metal surface and metal slab with the frequency of (a) 0.384 THz, (b) 0.62 THz, (c) 0.962 THz