Fig. 2
From: Phononic integrated circuitry and spin–orbit interaction of phonons
Characterization of phononic waveguide and identification of a traveling Rayleigh-like mode. a The measurement scheme. c An scanning electron microscope (SEM) image of a phononic waveguide. b, d–f, The out-of-plane (z-direction) displacement of a traveling Rayleigh-like mode. The data are measured by sending RF signal at 102 MHz into the IDT and scanning the vibrometer focal point in an area of 400 μm × 400 μm as illustrated in a. The reconstructed image of instant displacement is shown in d. The amplitude or phase at cross-sections of the two-dimensional scan are plotted in b, e, and f and taken at correspondingly colored lines in d. The magenta line in b represents the simulated displacement amplitude cross the waveguide, and the magenta lines in e and f are fitted to traveling acoustic wave with weak reflection (10% reflection)
