title: Acoustic Bloch oscillations in a two-dimensional phononic crystal.
abstract: 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.
authors.affiliation: Key Lab of Acoustic and Photonic Materials and Devices of Ministry of Education and Department of Physics, Wuhan University, Wuhan 430072, China.
authors.forename: Zhaojian
authors.initials: Z
authors.lastname: He
authors.forename: Shasha
authors.initials: S
authors.lastname: Peng
authors.forename: Feiyan
authors.initials: F
authors.lastname: Cai
authors.forename: Manzhu
authors.initials: M
authors.lastname: Ke
authors.forename: Zhengyou
authors.initials: Z
authors.lastname: Liu