The term ‘metamaterial’ describes a material that has properties which cannot be observed in nature. The main concept of those materials is the arrangement of repeating sub elements made of conventional material. The periodic alignment of those sub elements made of conventional material can result in completely different macroscopical material behavior. In many examples, metamaterials have dynamically modified properties as negative density, negative compressibility, or negative refraction. This special behavior offers a wide range of revolutionary applications in vibroacoustics.
