Observation of phase shifts in a vertical cavity quantum dot switch
Observation of phase shifts in a vertical cavity quantum dot switch
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DOI：
10.1063/1.3596704
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发表时间：
2011-06
影响因子：
4
通讯作者：
C. Jin;O. Kojima;T. Kita;O. Wada;M. Hopkinson
中科院分区：
文献类型：
--
作者：
C. Jin;O. Kojima;T. Kita;O. Wada;M. Hopkinson
我们研究了利用半导体量子点作为垂直几何结构中的光学移相器进行超高速信息处理的可能性。通过理论分析，预测了量子点结构中的光学相位非线性，这种非线性可以通过使用垂直光学腔来增强。制作了用于前后镜的16/30周期的非对称腔体结构，展示了一种具有显著非线性特性的实用光开关器件。采用倾斜泵浦方案，初步观察到了18°的相移。这一观察为在垂直腔内使用量子点的马赫-曾德尔光开关铺平了道路。
We have studied the possibility to utilize semiconductor quantum dots (QDs) as an optical phase shifter within a vertical geometry for ultrafast information processing. From theoretical analyses, an optical phase nonlinearity in QD structures has been predicted which can be enhanced through the use of an vertical optical cavity. Asymmetric cavity structures with 16/30 periods of GaAs/AlGaAs layers for the front/back mirrors have been fabricated to demonstrate a practical device with significant nonlinear characteristics for optical switching. A phase shift of 18° has been initially observed with a tilted pump scheme. This observation paves the way toward a Mach–Zehnder optical switch using QDs inside a vertical cavity.