Near Field - Quantum Dot Coupling in Plasmonic Nanoresonators

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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.