Emerging aspects in a plasma-metamaterial composite

When plasmas are immersed in a metamaterial structure, such a composite shows various properties which are not expected in an ordinary metamaterial. Plasmas are either generated by external powers or present in nature as a space plasma, and composites of metamaterials and such plasmas serve as elements of electromagnetic wave controllers as well as negative-refractive-index materials. This report describes the fundamental properties of the composites with specific examples, and some fields of potential applications for human space activities are surveyed.