Optical Properties | Of Solids

In the infrared range, light interacts directly with the vibrations of the crystal lattice (phonons). 5. Applications in Technology

Understanding these properties allows us to engineer materials for specific tasks: Optical Properties of Solids

, it can kick an electron from the valence band to the conduction band, causing absorption. In the infrared range, light interacts directly with

): Determines the speed of light in the material and how much it "bends" (refraction). Extinction Coefficient ( ): Determines the speed of light in the

An increase in electrical conductivity caused by light absorption (used in light sensors).

Light passing through the medium. Transparent materials like glass have electronic gaps larger than the energy of visible light, meaning photons pass through without being absorbed. 2. The Role of Band Structure

The most critical factor in a solid's optical behavior is its . Insulators and Semiconductors: These have a "band gap" ( Egcap E sub g ). If a photon's energy ( ) is greater than Egcap E sub g