Abstract
Electromagnetic metamaterials/metasurfaces have long captivated the increasing interest and popularity in flexibly manipulating electromagnetic waves and gradually developed into a novel paradigm of modern science and technology. Over the past decade, there have been a great number of new discoveries and results reported in this exciting area, and metamaterials/metasurfaces have led to a myriad of new engineering applications. This chapter introduces the subject of this book, reviews the general description of the metamaterial/metasurface, and provides a historical perspective on the origin, concept, and milestone of electromagnetic metamaterials/metasurfaces.
