Acoustic isolation and nonreciprocal sound transmission are highly desirable in many
practical scenarios. They may be realized with nonlinear or magneto-acoustic effects, but …

Phonons, the quanta of mechanical vibration, are important to the transport of heat and
sound in solid materials. Recent advances in the fundamental control of phonons …

We present a design of acoustic metasurfaces yielding asymmetric transmission within a
certain frequency band. The design consists of a layer of gradient-index metasurface and a …

Research on breaking time-reversal symmetry to realize one-way wave propagation is a
growing area in photonic and phononic crystals and metamaterials. In this Letter, we present …

We propose a two-dimensional model of acoustic prism comprising metamaterials with near-
zero refractive index to yield high efficiency unidirectional transmission and demonstrate an …

We design and experimentally demonstrate an acoustic tunnel completely open for
substances like fluids or other energy fluxes to exchange while allowing sound to pass only …

Traditional asymmetric transmission of elastic waves is mostly based on mode conversion,
which presents a real challenge to get pure-mode elastic waves. In this letter, without the aid …

This Letter presents the experimental characterization of nonreciprocal elastic wave
transmission in a single-mode elastic waveguide. This asymmetric system is obtained by …

The realization of unidirectional acoustic transmission (UAT) has recently aroused great
attention owing to the versatile possibility in acoustics-based applications. This paper …

Asymmetric manipulation of acoustic waves has gained significant attention due to its rich
physical properties and potential application prospects. In this study, we design and …