Avalanche Photodiodes
Avalanche Photodiodes (APDs) are semiconductor devices that convert light into electrical current. They operate by using a process called avalanche multiplication, where incoming photons generate electron-hole pairs. These pairs are then accelerated by a high electric field, leading to a chain reaction that amplifies the current.
APDs are commonly used in applications requiring high sensitivity, such as fiber optic communication and medical imaging. Their ability to detect low levels of light makes them valuable in various fields, including telecommunications and scientific research. However, they require careful biasing and temperature control to maintain optimal performance.