290fs switching time of Fe-doped quantum well saturable absorbers in a microcavity in 1.55μm range
290fs switching time of Fe-doped quantum well saturable absorbers in a microcavity in 1.55μm range
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1.55μm范围内微腔中铁掺杂量子阱可饱和吸收体的开关时间为290fs
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Y. Pellan
中科院分区：
文献类型：
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作者：
M. Gicquel;S. Loualiche;J. Even;C. Labbé;O. Dehaese;A. Corre;H. Folliot;Y. Pellan
通过在非对称法布里-珀罗微腔中插入掺铁多量子威尔斯（MQW）实现了超快全光开关。在InGaAs闪烁InP多量子阱外延生长过程中重Fe掺杂是一种良好控制的技术，以达到亚皮秒光学时间常数。采用金金属作为后镜，空气/InP界面作为前镜，实现了非对称法布里-珀罗微腔。使用传统的计划，这样的开关器件的泵浦探测实验进行了研究。该器件显示出超快的响应时间，低至290 fs，铁浓度为2× 1019 cm −3，对比度为8dB，阈值开关通量为3.5μJ scincm −2，在1.55 μm电信光谱范围内具有37 nm的3 dB带宽。
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.