Near Field - Quantum Dot Coupling in Plasmonic Nanoresonators

金属纳米结构(等离子体)能够将光限制在其表面附近，远远超出衍射极限。因此，预言了在离等离子体谐振器较近距离处的量子发射体可以处于强耦合区域。然而，最近的实验表明，发射器和等离子体E/M场之间的耦合强度出人意料地高。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，在回顾了偶极子近似模型的理论结果之后，我们进行了时域有限差分(FDTD)分析，以确定等离子体-量子点系统中的场分布。然后，我们计算了四极矩对耦合常数的贡献，并报告了高达24%的数值。其次，我们用FDTD环境下实现的自洽Maxwell-BLochapach方法研究了系统的近场强耦合。在研究了不同尺寸量子点的耦合强度后，我们预测了发射体和多个等离子体模之间的超快拉比振荡。

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.