Evidence of “crossed” transitions in dots-in-a-well structures through waveguide absorption measurements
Evidence of “crossed” transitions in dots-in-a-well structures through waveguide absorption measurements
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通过波导吸收测量证明井中点结构中的“交叉”跃迁
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Vittorio
中科院分区：
文献类型：
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作者：
G. Visimberga;G. Rainò;A. Salhi;V. Tasco;M. Todaro;L. Martiradonna;M. Giorgi;A. Passaseo;R. Cingolani;M. Vittorio
在室温下，通过在p-i-n结构中发射波长为1.3μm的STranski-Krastanov InAs点势垒系统上建立的波导传输装置，进行了面内吸收测量。利用量子点(QD)吸收的偏振相关性来分辨其离散和连续光谱分量，并在反向偏压作用下分别研究它们。在分立光谱分量中观察到的量子受限斯塔克效应证明了一个向上的约9.5×10−29 cm的量子偶极。研究发现，这种连续成分来源于量子态和量子井态的电子跃迁。
In-plane absorption measurements were performed at room temperature by means of a waveguide transmission setup on a Stranski–Krastanov InAs dots-in-a-well system emitting at 1.3μm embedded in a p-i-n structure. The polarization dependence of quantum dot (QD) absorption was exploited to resolve its discrete and continuous spectral components and study them separately under reverse bias application. The quantum confined Stark effect observed in the discrete spectral component gave evidence of an upward built-in QD dipole of about 9.5×10−29Cm. The continuous component was found to originate from electronic transitions involving a QD state and a quantum well state.