Advances in Research on Left-handed Metamaterials

Left-handed metamaterials,of which the dielectric constant and the magnetic permeability are simultaneously negative,are a kind of electromagnetism materials.This paper gives a introduction to the basic principles of left-handed materials,and expatiates on the preparation ways of this materials in microwave region,infrared region and visible light region.In the end the application prospects are put forward with left-handed metamaterials.