A metamaterial is a material that has been designed to have a desired set of properties that are not found in nature. They are often created by combining multiple materials to create a composite material with the desired properties. Metamaterials have a wide range of potential applications, including cloaking devices, negative refraction, and superlenses.
Some of the emerging trends in metamaterials include the use of 3D printing to create complex structures, the use of nanomaterials to create new functionalities, and the use of artificial intelligence to design and optimize metamaterials.