TY - JOUR
T1 - Maximum Willis Coupling in Acoustic Scatterers
AU - Quan, Li
AU - Ra'Di, Younes
AU - Sounas, Dimitrios L.
AU - Alù, Andrea
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/6/20
Y1 - 2018/6/20
N2 - Willis coupling in acoustic materials defines the cross-coupling between strain and velocity, analogous to bianisotropic phenomena in electromagnetics. While these phenomena have been garnering significant attention in recent years, to date their effects have been considered mostly perturbative. Here, we derive general bounds on the Willis response of acoustic scatterers, show that these bounds can be reached in suitably designed scatterers, and outline a systematic venue for the realistic implementation of maximally bianisotropic acoustic inclusions. We then employ these inclusions to realize acoustic metasurfaces for bending and steering of sound with unitary efficiency.
AB - Willis coupling in acoustic materials defines the cross-coupling between strain and velocity, analogous to bianisotropic phenomena in electromagnetics. While these phenomena have been garnering significant attention in recent years, to date their effects have been considered mostly perturbative. Here, we derive general bounds on the Willis response of acoustic scatterers, show that these bounds can be reached in suitably designed scatterers, and outline a systematic venue for the realistic implementation of maximally bianisotropic acoustic inclusions. We then employ these inclusions to realize acoustic metasurfaces for bending and steering of sound with unitary efficiency.
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U2 - 10.1103/PhysRevLett.120.254301
DO - 10.1103/PhysRevLett.120.254301
M3 - Article
C2 - 29979059
AN - SCOPUS:85048962732
SN - 0031-9007
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
IS - 25
M1 - 254301
ER -