Applied Physics Letters · 2004 · 23 citations · 22 references
EngineeringElectrical EngineeringMaterials ScienceOptical MaterialsOpticsPhotonicsOptical Properties Of SemiconductorsOptical SwitchingQuantum Well DevicesQuantum WellsRare-earth-doped MaterialsUltrafast OpticsAll-optical SwitchingContrast RatioFabry-perot ResonatorsOptical Absorption In Quantum WellsPhotonic SwitchesResponse TimeSwitching DevicesUltrafast Optical Response
Ultrafast all-optical switch has been demonstrated by inserting Fe-doped multiple quantum wells (MQWs) in asymmetric Fabry-Perot microcavities. Heavy Fe doping during the InGaAs∕InP MQW epitaxial growth is a well-controlled technique to reach subpicosecond optical time constants. An asymmetric Fabry-Perot microcavity using gold metal as a back mirror and air/InP interface as a front mirror is realized. Pump-probe experiments using a conventional scheme on such switching devices are investigated. The device reveals an ultrafast response time, as low as 290fs, for an iron concentration of 2×1019cm−3, a contrast ratio of 8dB, a threshold switching fluence of 3.5μJ∕cm−2, and a 37-nm 3-dB bandwidth in the 1.55-μm telecommunication spectral range.
22
Room-temperature excitons in 1.6-μm band-gap GaInAs/AlInAs quantum wells
J. S. Weiner, D. S. Chemla, David A. B. Miller et al. · Applied Physics Letters · 1985 · 166 citations