Near Field - Quantum Dot Coupling in Plasmonic Nanoresonators

近场 - 等离激元纳米谐振器中的量子点耦合

• 批准号: 2012656
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2012656
• 关键词: Near; Field; Quantum; Dot; Coupling

Metallic nanostructures (Plasmonics) have the ability to confine light close to their surfacesfar beyond the diffraction limit. It is therefore predicted that a quantum emitter at shortdistance from a plasmonic resonator can be in strong coupling regime. Recent experimentaldemonstrations however report an unpredicted high coupling strength between the emitterand the plasmonic E/M field. In this thesis, we investigate the near-field influence of threeplasmonic nanoresonators on the strong coupling of semiconductor quantum dots fromtwo different approaches. First, after revisiting the theoretical results for models beyondthe dipole approximation, we perform Finite-Difference-Time-Domain (FDTD) analysis todetermine the field distribution in Plasmonic-QD systems. We then calculate the quadrupolecontribution to the coupling constant and report values as high as 24% Second, we investigatethe near-field strong coupling of the system by using the self-consistent Maxwell-Blochapproach implemented in FDTD environment. After studying the coupling strength fordifferent sizes of the QD we predict ultra-fast Rabi oscillations between the emitter andmultiple plasmonic modes.

金属纳米结构（等离子体）具有将光限制在其表面附近的能力，远远超过衍射极限。因此，我们可以预测，在离等离子体共振器很近的距离处的量子发射体可以处于强耦合状态。然而最近的实验演示报道了发射体和等离子体E/M场之间的不可预测的高耦合强度。在本论文中，我们从两种不同的方法研究了三种等离子体纳米谐振器对半导体量子点强耦合的近场影响。首先，在回顾了偶极近似模型的理论结果之后，我们进行了时域有限差分法（FDTD）分析来确定等离子体量子点系统中的场分布。然后，我们计算了四极耦合常数和报告值高达24%。其次，我们研究了近场强耦合的系统，使用自洽Maxwell-Bloch方法在FDTD环境中实现。在研究了不同尺寸量子点的耦合强度后，我们预测了发射极和多个等离子体激元模之间的超快拉比振荡.