Fig. 1. Schematic function tunability with temperature and designs of the smart metadevices. (a) O-SME: one-way shape memory effect; T-SME: two-way shape memory effect. (b) and (c) To demonstrate the concept, three devices are designed.

Fig. 2. Experimental verification of tunable EOT-like behavior. (a) Illustration of thermal tunable metadevices with EOT-like response in C-band. (b) Schematics and samples of two metadevices. (c) and (e) are simulated, (d) and (f) are measured transmission results for SRR and long stick structure, respectively. Insets of (c) and (d) plot enhancement factor for models in (b).

Fig. 3. The control over the operating frequency and amplitude of EOT-like peak and near-field distribution. (a) and (b) show the tunable abilities of proposed metadevice for operating frequency and transmission amplitude. (c–f) Schematic of distribution of simulated currents and electric fields for SRR and long stick model. External excitation electric field induced a ring current for SRR, while a dipole current for long stick model. Such current distribution leads to electric field distribution in (e) and (f).

Fig. 4. Dual-band and periodic model. (a) and (c) are measured, (b) and (d) are simulated transmission results for left-pass and right-pass independent, respectively. (e) The concept that the SRR is extended to form metasurfaces. (f) Under the same polarized electromagnetic signal, the metasurfaces made of SRR possess identical performance with metadevice working in waveguide.

Fig. 5. Independent transmission modulation of the dual-band model. (a) and (b) are measured independent transmission modulation results for left-pass (operating frequency: f₁) and right-pass (operating frequency: f₂), respectively.