[22p-C102-1~16] 22.1 Joint Session M "Phonon Engineering"

[22p-C102-16] Microwave impedance microscopy imaging of topological surface acoustic wave on a patterned substrate.

〇Yoichi Nii^1,2, Yoshinori Onose¹ (1.IMR, Tohoku Univ., 2.JST PRESTO)

Keywords:topology, surface acoustic wave, Microwave impedance microscopy

We have studied acoustic topological edge modes in a honeycomb phononic crystal composed of metallic nano-pillars on a LiNbO₃ substrate. Pulse-type microwave impedance microscopy realized clear visualization of the gigahertz topological edge mode between two mutually inverted topological phononic crystals.The realization of a topological waveguide in a simple pillar structure on a substrate might pave a new path to the development of topological SAW devices.