A semiconductor laser that emits light perpendicular to the substrate. It can be tested on the wafer and easily arranged in 2D arrays, so it is used in data links and as the light source for face recognition.
Field: Compound semiconductors
A VCSEL has a short cavity sandwiched between distributed Bragg reflectors (DBRs) of dozens of layers and emits a circular beam perpendicular to the wafer.
Which is a characteristic of a VCSEL (vertical-cavity surfa…2DEG (two-dimensional electron gas) Alloy semiconductor Direct band gap Efficiency droop Ga2O3 (gallium oxide) GaAs (gallium arsenide) GaN (gallium nitride) HEMT (high-electron-mobility transistor) III-V compound semiconductor InP (indium phosphide)