Made of ultra-pure glass with extremely low absorption ( ) to carry data over thousands of miles.
In semiconductors, an absorbed photon can create a bound electron-hole pair called an exciton, which dominates the optical spectrum at low temperatures. Optical Properties of Solids
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 Made of ultra-pure glass with extremely low absorption
An increase in electrical conductivity caused by light absorption (used in light sensors). Insulators and Semiconductors: These have a "band gap"
Since there is no gap, metals can absorb light at very low energies. However, above a certain frequency (the plasma frequency ), metals actually become transparent because the electrons can no longer keep up with the light's oscillation. 3. Key Optical Constants