Femit
Femit is a speculative concept in nano-optoelectronics describing a nanoscale device capable of emitting and routing ultrafast particles or photons under the control of femtosecond-scale excitation. The term blends femto- (10^-15) with emit, indicating ultrafast emission. In theoretical discussions, femit devices are imagined as integrated emitters that can be switched on and off with femtosecond precision and produce single photons or electron packets with defined energy, timing, and polarization.
Most proposals describe a heterostructure that combines a quantum emitter (such as a quantum dot or defect
Potential applications include ultrafast spectroscopy, high-bandwidth optical communications, and interfaces for quantum information processing, where control
At present, femit remains a theoretical or speculative concept with limited experimental demonstration, used mainly to
See also: femtosecond pulse, quantum emitter, nanophotonics, ultrafast optics, plasmonics.