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

Autor:	Olivier Dehaese, A. Le Corre, Maud Gicquel-Guézo, Slimane Loualiche, Y. Pellan, H. Folliot, C. Labbé, Jacky Even
Rok vydání:	2004
Předmět:	Materials science Physics and Astronomy (miscellaneous) business.industry Optical switch Gallium arsenide Switching time Optical pumping chemistry.chemical_compound Optics chemistry Optoelectronics Contrast ratio business Ultrashort pulse Quantum well Molecular beam epitaxy
Zdroj:	Applied Physics Letters. 85:5926-5928
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.1804239
Popis:	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.
Databáze:	OpenAIRE
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