Plasmon-Field-Induced Metastable States in the Wetting Layer: Detected by the Fluorescence Decay Time of InAs/GaAs Single Quantum Dots,ACS Photonics

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Plasmon-Field-Induced Metastable States in the Wetting Layer: Detected by the Fluorescence Decay Time of InAs/GaAs Single Quantum Dots
ACS Photonics ( IF 6.5 ) Pub Date : 2020-11-02 , DOI: 10.1021/acsphotonics.0c01311
Hao Chen _{1,

2} , Junhui Huang _{1,

2} , Xiaowu He _{1,

2} , Kun Ding ₁ , Haiqiao Ni _{1,

2} , Zhichuan Niu _{1,

2,

3} , Desheng Jiang ₁ , Xiuming Dou _{1,

2} , Baoquan Sun _{1,

2,

3}

Affiliation

We report a new way to slow down the spontaneous emission rate of excitons in the wetting layer (WL) through radiative field coupling between the exciton emissions and the dipole field of metal islands. As a result, a long-lifetime decay process is detected in the emission of InAs/GaAs single quantum dots (QDs). It is found that when the separation distance from the WL layer (QD layer) to the metal islands is around 20 nm and the islands have an average size of approximately 50 nm, the QD lifetime may change from approximately 1 to 160 ns. The corresponding second-order autocorrelation function g⁽²⁾(τ) changes from antibunching into a bunching and antibunching characteristics due to the existence of long-lived metastable states in the WL. This phenomenon can be understood by treating the metal islands as many dipole oscillators in the dipole approximation, which may cause destructive interference between the exciton dipole field and the induced dipole field of the metal islands.

中文翻译：

等离子场在润湿层中诱导的亚稳态：通过InAs / GaAs单量子点的荧光衰减时间检测。

我们报告了一种通过激子发射和金属岛的偶极子场之间的辐射场耦合来减慢润湿层（WL）中激子自发发射速率的新方法。结果，在InAs / GaAs单量子点（QD）的发射中检测到了长寿命的衰减过程。已经发现，当从WL层（QD层）到金属岛的间隔距离为大约20nm并且岛的平均尺寸为大约50nm时，QD寿命可以从大约1ns变化到160ns。对应的二阶自相关函数g ^（2）（τ）由于WL中存在长寿命的亚稳态而从反聚束变为聚束和反聚束特征。通过将金属岛视为偶极子近似中的许多偶极子振荡器，可以理解这种现象，这可能会导致激子偶极子场和金属岛的感应偶极子场之间产生相消干涉。

更新日期：2020-11-18

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