title: Elastic metamaterials with simultaneously negative effective shear modulus and mass density.
abstract: We propose a type of elastic metamaterial comprising fluid-solid composite inclusions which can possess a negative shear modulus and negative mass density over a large frequency region. Such a material has the unique property that only transverse waves can propagate with a negative dispersion while longitudinal waves are forbidden. This leads to many interesting phenomena such as negative refraction, which is demonstrated by using a wedge sample and a significant amount of mode conversion from transverse waves to longitudinal waves that cannot occur on the interface of two natural solids.
authors: Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors: Ying
authors: Y
authors: Wu
authors: Yun
authors: Y
authors: Lai
authors: Zhao-Qing
authors: ZQ
authors: Zhang