Metamaterials (from the Greek word "meta-", μετά- meaning "to go beyond") are smart materials engineered to have properties that have not yet been found in nature. They are made from assemblies of multiple elements fashioned from composite materials such as metals or plastics. The materials are usually arranged in repeating patterns, at scales that are smaller than the wavelengths of the phenomena they influence. Metamaterials derive their properties not from the properties of the base materials, but from their newly designed structures. Their precise shape, geometry, size, orientation and arrangement gives them their smart properties capable to manipulate electromagnetic waves: by blocking, absorbing, enhancing, bending waves, to achieve benefits that go beyond what is possible with conventional materials.
Appropriately designed metamaterials can affect waves of electromagnetic radiation or sound in a manner not observed in bulk materials. Those that exhibit a negative index of refraction for particular wavelengths have attracted significant research. These materials are known as negative index metamaterials.
Metamaterials is a peer-reviewed scientific journal that was established in March 2007. It is published by Elsevier in association with the Metamorphose Network of Excellence. The Coordinating Editor is Mikhail Lapine. The journal is published quarterly, with occasional special issues. The journal covers research concerning metamaterials, such as artificial electromagnetic materials, which includes various types of composite periodic structures and frequency selective surfaces in the microwave and optical range. Metamaterials is abstracted and/or indexed in the following databases: Chemical Abstracts Service (CAS), Compendex, Ei Compendex, Inspec, and Scopus.
The following is derived from the list of Top 10 Cited articles published in the last five years, extracted from Scopus on Sunday, June 6, 2010. The articles listed here on not necessarily in order of most cited.