fig2

Figure 2. Ultrasonic reflection of the metagel film. Simulation results of acoustic field distribution (A) at 2 MHz and (B) at 6 MHz; (C) Ultrasonic reflection spectra of the metagel. Parameter effects on cutoff frequency of (D) lattice constant a, (E) filling ratio q and (F) air-cell height h. Parameter effects on reflectivity at cutoff frequency of (G) a, (H) q and (I) h; (J) Ultrasonic reflection without deformation and (K), with 40% bending deformation; (L) Ultrasonic reflection spectra with different degrees of deformation.