Broadband subwavelength sensitivity to symmetry defects of disordered slabs

Élie Chéron (1) , Simon Félix (1) , Vincent Pagneux (1)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans

We observe a broadband and subwavelength sensitivity of the recently reported enhanced transmission through symmetric diffusive slabs [Chéron et al., Phys. Rev. Lett. 122, 125501 (2019)]. From a perfectly symmetric distribution of scatterers on both sides of an opaque barrier within a waveguide, a shift as small as λ/200 significantly alters the multiple interferences giving rise to the transmission enhancement, and this subwavelength sensitivity appears on a very broad frequency range and without averaging. Analyses, from either full wave numerics or random matrix theory, show how the minimum shifting distance to suppress the transmission enhancement scales with the wavelength and the strength of the barrier.

Domaines: Systèmes désordonnés et réseaux de neurones [cond-mat.dis-nn]; Physique [physics]; Acoustique [physics.class-ph]; Optique [physics.optics]

Élie Chéron, Simon Félix, Vincent Pagneux. Broadband subwavelength sensitivity to symmetry defects of disordered slabs. Physical Review B, 2020, 102 (13), ⟨10.1103/PhysRevB.102.134201⟩. ⟨hal-02991375⟩