290 fs switching time of Fe-doped quantum well saturable absorbers in a microcavity in 1.55 μm range

Gicquel-Gu&ecute;zo, M.; Loualiche, S.; Even, J.; Labbé, C.; Dehaese, O.; Le Corre, A.; Folliot, H.; Pellan, Y.
December 2004
Applied Physics Letters;12/13/2004, Vol. 85 Issue 24, p5926
Academic Journal
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 290 fs, for an iron concentration of 2×1019 cm-3, a contrast ratio of 8 dB, a threshold switching fluence of 3.5 μJ/cm-2, and a 37-nm 3-dB bandwidth in the 1.55-μm telecommunication spectral range.


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