Fig. 1. (a) Polarization conversion principle of the MPM. (b) Size dimensioning of the MPM. (c) Schematic diagram of the angle-resolved terahertz time-domain spectroscopy polarization system (AR-THz-TDPS) experimental system. (d) Design flowchart of the MO metasurface: phase design, equation deduction, data screening, and confirmation of the meta-atom size (inset graph: the Si-dielectric metasurface and its local electron micrograph). (e) Schematic diagram of the beam deflection of the dynamical MO metasurface at $f_1=0.25\mathrm{THz}$ and $f_2=0.5\mathrm{THz}$.

Fig. 2. Simulation transmission map with different frequencies and deflection angle ranges under the working EMFs of $+0.24$, 0, and $-0.24\mathrm{T}$.

Fig. 3. (a) Experimental intensity transmission spectra at different deflection angles under three working EMFs. The detailed intensity transmission efficiency under the deflection angles of ${\mathrm{\Phi }}_1$, ${\mathrm{\Phi }}_2$, and ${\mathrm{\Phi }}_3$ and the working EMFs at (b) 0.25 and (c) 0.5 THz. (d) Modulation depths of different deflection channels of ${\mathrm{\Phi }}_1$, ${\mathrm{\Phi }}_2$, and ${\mathrm{\Phi }}_3$.

Fig. 4. (a) Diagrammatic sketch of the 2D far-field scanning THz-TDS experimental system. (b) Schematic diagram of the focused far-field at dynamical multiplexing channels. (c) Far-field distributions of target polarization at dual frequencies and three working EMFs. (d) Values of ${\mathrm{\Gamma }}_{\text{channel}}$ at different deflection angles (${\mathrm{\Phi }}_1$, ${\mathrm{\Phi }}_2$, and ${\mathrm{\Phi }}_3$) and EMFs from $-0.24$ to $+0.24\mathrm{T}$.

Fig. 5. (a) Schematic diagram of the nonreciprocal one-way transmission. (b) Simulated transmission map with various EMFs from $-0.24$ to $+0.24\mathrm{T}$ at a frequency band of 0.15 to 0.65 THz under the deflection angles of ${\mathrm{\Phi }}_1$ and ${\mathrm{\Phi }}_3$. The transmission efficiency with various EMFs under the deflection angles of ${\mathrm{\Phi }}_1$ and ${\mathrm{\Phi }}_3$ at (c) 0.25 and (d) 0.5 THz. (e) Isolation rates of the MO system at dual working frequencies under different EMFs from 0 to 0.24 T.