Fig. 3: Experimental verification of efficient waveguide.
From: Realization of ultrathin waveguides by elastic metagratings
a Sample of an ultrathin “L”-shaped waveguide made of metagratings. A piezoelectric wafer is bonded at point S to generate omnidirectional flexural waves. b Experimentally measured (EXP) and simulated (FEM) energy fields of the waveguide at 13–15 kHz. The tested region is framed by the white dashed box. The scale bars are suitable for all EXP and FEM data. c Contrast ratios \({\eta }_{A/C}\) and \({\eta }_{B/C}\) as a function of frequency f. The subscripts A, B, C refer to regions marked in (a). Dots refer to the measured contrast ratio with (w/) the waveguide. Dashed curves refer to the theoretical contrast ratio without (w/o) waveguide.
