Acoustic Bloch oscillations in a two-dimensional phononic crystal.
We report the observation of acoustic Bloch oscillations at megahertz frequency in a two-dimensional phononic crystal. By creating periodically arrayed cavities with a decreasing gradient in width along one direction in the phononic crystal, acoustic Wannier-Stark ladders are created in the frequency domain. The oscillatory motion of an incident Gaussian pulse inside the sample is demonstrated by both simulation and experiment.
He
Zhaojian
Z
Key Lab of Acoustic and Photonic Materials and Devices of Ministry of Education and Department of Physics, Wuhan University, Wuhan 430072, China.
Peng
Shasha
S
Cai
Feiyan
F
Ke
Manzhu
M
Liu
Zhengyou
Z