2018/10/02 by M. Dubois, Marc Dubois, J. Perchoux +23
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Acoustic Wave Phenomena Research #Acoustic wave #Acoustics #Aerodynamics and Acoustics in Jet Flows #Brillouin zone #Diffraction #Intersection (aeronautics) #Materials science #Optics #Physics #Reflection (computer programming) #Sound pressure #Underwater Acoustics Research #physics.class-ph
paper · pdf · doi:10.1103/physrevb.99.100301
published as Phys. Rev. B 99, 100301 (2019) · 6 pages, 5 figures
arxiv created 2018/10/02 · openalex publication_date 2019/03/13 · arxiv updated 2019/03/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Acoustic flat lensing is experimentally confirmed, using optical feedback interferometry, for a phononic array of rigid spheres placed in air. The array behaves as an indefinite medium characterized by tensors whose principal elements have different signs, allowing for effects such as negative refraction and high impedance surface reflection. Here, this behavior is achieved in a narrow frequency region around 10.6 kHz, where the acoustic band displays a hidden singularity unveiled by an unusual path in the irreducible Brillouin zone.