Efficient nonreciprocal mode transitions in spatiotemporally modulated acoustic metamaterials
Zhaoxian Chen, Yu‐Gui Peng, Haoxiang Li, Jingjing Liu, Yujiang Ding, Bin Liang, Xuefeng Zhu, Yanqing Lu, Jian‐Chun Cheng, Andrea Alù
Abstract
-ω space between different diffraction modes. On the basis of these principles, we demonstrate efficient nonreciprocal sound steering, showcasing unidirectional evanescent wave conversion and nonreciprocal upconversion focusing. More generally, our metamaterial platform offers opportunities for generation of nonreciprocal Bloch waves and extension to other domains, such as non-Hermitian topological and parity-time symmetric acoustics.
Topics & Concepts
MetamaterialPhysicsAcousticsReciprocity (cultural anthropology)Topology (electrical circuits)OpticsElectrical engineeringPsychologySocial psychologyEngineeringAcoustic Wave Phenomena ResearchMetamaterials and Metasurfaces ApplicationsQuantum Mechanics and Non-Hermitian Physics