Explanation

metamaterials are a kind of artificial materials with special properties, especially those materials with negative refractive index. These materials are composed of composite materials with novel artificial structures, which have extraordinary physical properties, which are usually absent in materials in nature. The properties of metamaterials mainly depend on their special artificial structures, especially their precise geometric structures and size. These large-area, consistent and precise geometry, size, orientation and assembly methods can enable light and electromagnetic waves to bend, scatter or transmit in a way that natural materials cannot achieve. At present, metamaterials that have been developed include photonic crystal, left-handed materials, negative refractive index materials and plasmas. The research of metamaterials involves many fields, including electronic engineering, electromagnetics, solid state physics, microwave and antenna engineering, optoelectronics, traditional optics, materials science, semiconductor engineering, and nanoscience. It is a highly interdisciplinary emerging discipline. For example, photonic crystal like metamaterials have been used in photonic crystal fiber, low threshold laser oscillators, high-efficiency luminescence diodes, microwave antennas and other fields. Theorists predict that metamaterials have the potential to be used to manufacture various stealth devices, which can make light and electromagnetic waves around objects bypass, thus making objects difficult to detect.

Classification