Negative Refraction in Metamaterials

This lecture covers the concept of negative refraction in metamaterials, starting with the electromagnetic properties and refractive index of different materials, including crystals, dielectrics, and semiconductors. The instructor discusses the reversal of Snell's law in negative refraction, presents experimental verification of a negative index of refraction, and explains the engineering of magnetic permeability using split-ring resonators. The transition from individual structures to metamaterials is explored, highlighting the importance of isotropy. Various attempts to produce isotropic structures are discussed, along with the engineering of negative permittivity in plasma materials through microwire arrays and copper wires. The lecture concludes with refractive index measurements using different materials like Teflon and metamaterials with negative refractive indices.