Sound-impenetrable holes in water based on acoustic complementary medium
College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University - Suzhou 215006, China
Received: 22 August 2016
Accepted: 17 September 2016
By designing a two-dimension acoustic complementary medium of water, we demonstrate the possibility of realizing a sound-impenetrable hole that can block acoustic waves in water. The complementary medium is composed of core-shell rubber cylinders in a square lattice, and possesses the exact negative values of water in both the effective density and bulk modulus at a working frequency. The effects of negative refraction as well as the sound-impenetrable hole are verified by numerical simulations. Interestingly, by introducing a small amount of loss, we find that the functionality of such a sound-impenetrable hole becomes robust and works in a broad frequency range.
PACS: 81.05.Xj – Metamaterials for chiral, bianisotropic and other complex media / 43.40.+s – Structural acoustics and vibration
© EPLA, 2016