## 3 Results and Discussions
Figure 4b shows the transmission spectra of the RTM device in TM mode. It is clear that the change has no remarkable influence on the resonances, which means that the RTM device has a stable performance by moving the SRR-2 and SRR-4 meta-atoms along the positive \(y\)-axis direction in TM mode. Figure 4: Simulated transmission spectra of the RTM device obtained by moving the SRR-2 and SRR-4 meta-atoms along positive \(y\)-axis direction in (**a**) TE and (**b**) TM modes. Figure 3: Simulated transmission spectra of the RTM device obtained by moving the SRR-1 and SRR-2 meta-atoms along positive \(y\)-axis direction in (**a**) TE and (**b**) TM modes. Figure 6a,b shows the simulated transmission spectra of RTM device by moving SRR-2 meta-atom along positive \(x\)-axis direction in TE and TM modes, respectively. In order to achieve a better understanding of the physical mechanism related to the electromagnetic response, the corresponding E-field and H-field distributions of SRR-2 meta-atom with \(x_{2}\) = 24 \(\upmu\)m in TE mode are shown in Figure 7. In TE mode, there is a resonance at 0.49 THz for the initial state of \(x_{2}\) = 16 \(\upmu\)m as shown in Figure 6a. When \(x_{2}\) value moves to 20 \(\upmu\)m, there is an additional EIT response found at 0.45 THz. When SRR-2 meta-atom continuously moves to 24 \(\upmu\)m, 28 \(\upmu\)m and 32 \(\upmu\)m, there are two EIT resonances at 0.45 THz and 0.51 THz. There are nonuniform E-field distributions shown in Figure 7a-c. These unbalanced electromagnetic energies result in the generations of Fano resonances. In TM mode, there are three resonances at 0.50 THz, 0.67 THz and 0.91 THz as shown in Figure 6b. These three resonances are insensitive to the movement of SRR-2 meta-atom along positive \(x\)-axis direction. It indicates the proposed RTM device exhibits the tunable EIT resonance in TE mode and stable resonance in TM mode. Figure 5: (**a,b**) E-field and (**c,d**) H-field distributions of the RTM device with \((y_{2},y_{4})\) = (24, \(-\)8) \(\upmu\)m in TE mode. Figure 6: Simulated transmission spectra of the RTM device obtained by moving the SRR-2 meta-atom along positive \(x\)-axis direction in (**a**) TE and (**b**) TM modes. To control the electromagnetic response of the proposed RTM design, SRR-2 and SRR-3 meta-atoms are moved symmetrically along positive and negative \(x\)-axis directions. \(x_{2}\) and \(x_{3}\) values are moved from the position of (16, \(-\)16) to (32, \(-\)32), while \(y_{2}\) and \(y_{3}\) values are kept at the initial positions. Figure 8 shows the simulated transmission spectra of the RTM device by moving SRR-2 and SRR-3 meta-atoms along positive and negative \(x\)-axis directions in TE and TM modes, respectively. In TE mode, when the position of (\(x_{2}\), \(x_{3}\)) moves from (16, \(-\)16) to (32, \(-\)32), the resonances are almost kept constant as shown in Figure 8a. In TM mode, there are three resonances at 0.50 THz, 0.67 THz and 0.91 THz for the initial state of (\(x_{2}\), \(x_{3}\)) = (16, \(-\)16) as the black curve shown in Figure 8b. By moving \(x_{2}\) and \(x_{3}\) values symmetrically along both \(x\)-axis directions from the position of (16, \(-\)16) to (32, \(-\)32), the first and third resonances will vanish gradually while the second resonance is stable at 0.67 THz. Such RTM design provides the possibility of optical switch application. Figure 9 shows the simulated transmission spectra of the RTM device by moving SRR-2 and SRR-3 meta-atoms along positive and negative \(y\)-axis directions in TE and TM modes. In TE mode, there are two resonances found at 0.49 THz and 0.92 THz for the initial state of (\(y_{2}\), \(y_{3}\)) = (16, \(-\)16) as shown in Figure 9a. By moving \(y_{2}\) and \(y_{3}\) values symmetrically along positive and negative \(y\)-axis directions in TE and TM modes, in TE mode, there are two resonances found at 0.54 THz, while the one at 0.92 THz remains stable.