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Chinese Physics Letters

Polarization Properties of Quantum-Dot-Based Single Photon Sources

韩朔, Hao Zhi Biao, Yi Luo

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

从作为壁炉量点(QD ) 的光抽射出的单个光子的极化性质被使用一个四水平的系统模型学习。模型能够向极化解释在单个光子排放实验观察的不确定性。泵力量上的光子排放效率和极化可见性的依赖在一般情况中是相反的，这被发现。由与小尺寸和强壮的搬运人监禁采用 QD，在高泵力量下面的光子极化可见性能被改进。另外，嵌入一个很好设计的微洞也被发现赞成的 QDinto，而在高极化可见性和多光子排放之间的交易被注意。

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从作为壁炉量点(QD ) 的光抽射出的单个光子的极化性质被使用一个四水平的系统模型学习。模型能够向极化解释在单个光子排放实验观察的不确定性。泵力量上的光子排放效率和极化可见性的依赖在一般情况中是相反的，这被发现。由与小尺寸和强壮的搬运人监禁采用 QD，在高泵力量下面的光子极化可见性能被改进。另外，嵌入一个很好设计的微洞也被发现赞成的 QDinto，而在高极化可见性和多光子排放之间的交易被注意。
在这份报纸， quantumdot 半导体的反应上的同类、不同类的拓宽的效果光放大器(QD-SOAs ) 被调查。第一次，州的空间模型被用来模仿 QD-SOA 的静态、动态的特征。与减少，同类、不同类的拓宽， QD-SOA 减少的浸透力量和光获得和 ultrafast 获得压缩增加，这被发现。模拟结果与减少显示出那从 20 ～ 1 兆电子伏的同类的拓宽，从 40% ～ 90% 的获得压缩增加，不饱和的光获得变得近似翻三倍，并且浸透力量少些成为 two times。另外，模拟与减少表明那从 50 ～ 25 兆电子伏的不同类的拓宽，从不到 50% 的获得压缩增加到超过 90% ，不饱和的光获得成为近似 10 褶层，和浸透力量成为更少三次。另外，同类、不同类的线宽应该为非线性的应用是小的，这被发现。同类、不同类的拓宽需要为线性应用足够大。
Polarization properties of single photons emitted by optical pumping from a single quantum dot (QD) are studied by using a four-level system model. The model is capable of explaining the polarization uncertainty observed in single photon emission experiments. It is found that the dependence of photon emission efficiency and polarization visibility on pump power are opposite in general cases. By employing QDs with small size and strong carrier confinement, the photon polarization visibility under high pump power can be improved. In addition, embedding a QD into a well designed microcavity is also found to be favourable, whereas the trade-off between high polarization visibility and multi-photon emission is noted.
Abstract The collection of single‐photon emission from a quantum dot (QD) in a Bragg waveguide through a photonic wire bond (PWB) via free‐space resonant frequency pumping at 1.6 K is demonstrated. The in‐fiber single photons show a small multiphoton contribution, quantified by a low second order photon autocorrelation value of (background‐corrected) or (raw data). The decay time of the QD is measured to be ps. The PWB obviates the need for in‐cryostat alignment of the single‐photon source with an optical fiber and thus offers a route to scalable integration of quantum photonic devices in a cryogenic environment. Uniquely, the approach combines the QD‐waveguide technique, enabling resonant driving of individual QDs without the need for cross‐polarization filtering, and the PWB for deterministic, alignment‐free coupling of single‐photon sources to optical fibers.