[Publication] Janus acoustic metascreen with nonreciprocal and reconfigurable phase modulations

Inspired by “the God Janus” analogy, in this work, our researchers have introduced the concept of Janus acoustic metascreen for independent wavefront manipulations for two opposite incidences, producing two-faced and independent wavefront manipulations for two opposite incidences. They have used acoustic resonators with rotating inner cores to achieve high nonreciprocity, and demonstrate tunable combinations of wavefront manipulations.

A series of Janus acoustic metascreens including optional combinations of negative refraction, acoustic focusing, sound absorption, acoustic diffusion, and beam splitting have been demonstrated through numerical simulations and experiments, showing their great potential for acoustic wavefront manipulation and structuration.

In this proposed research, completely achieved in the Metamaterials and Phononics' group of IJL, we put forward numerical and experimental approaches and analyses to demonstrate the unprecedented concept of Janus acoustic metascreen for wave manipulation and structuration.

Our finding opens a new route for nonreciprocal and Janus acoustic metadevices for myriad of multifunctional and compact systems as well as related applications.

References :

Title : Janus acoustic metascreen with nonreciprocal and reconfigurable phase modulations

Authors: Yifan Zhu, Liyun Cao, Aurélien Merkel, Shi-Wang Fan, Brice Vincent, Badreddine Assouar

Journal: Nature Communications

Date of publication (online): December 2021

Link: https://www.nature.com/articles/s41467-021-27403-4

Image caption:
The concept of Janus acoustic metascreen. The numerical simulation of the wave front structuration, and experimental evidence of focusing and absorption functionalities produced under incidences from the two sides of the metascreen.

Read the focus on the CNRS's website (in French)