Near Field - Quantum Dot Coupling in Plasmonic Nanoresonators

Lead Research Organisation: Imperial College London
Department Name: Physics


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

Planned Impact

The main impact of the proposed Hub will be in training quantum engineers with a skillset to understand cutting-edge quantum research and a mindset toward developing this innovation, and the entrepreneurial skills to lead the market. This will grow the UK capacity in quantum technology. Through our programme, we nurture the best possible work force who can start new business in quantum technology. Our programme will provide multi-level skills training in quantum engineering in order to enhance the UK quantum technologies landscape at several stages. Through the training we will produce quantum engineers with training in innovation and entrepreneurship who will go into industry or quantum technology research positions with an understanding of innovation in quantum technology, and will bridge the gap between the quantum physicist and the classical engineer to accelerate quantum technology research and development. Our graduates will have to be entrepreneurial to start new business in quantum technology. By providing late-stage training for current researchers and engineers in industry, we will enhance the current landscape of the quantum technology industry. After the initial training composed of advanced course works, placements and short projects, our students will act as a catalyzer for collaboration among quantum technology researchers, which will accelerate the development of quantum technology in the UK. Our model actively encourages collaboration and partnerships between Imperial and national quantum tehcnology centres and we will continue to maintain the strong ties we have developed through the Centre for Doctoral Training in order to enhance our on-going training provisions. The Hub will also have an emphasis on industrial involvement. Through our new partnerships students will be exposed to a broad spectrum of non-academic research opportunities. An important impact of the Hub is in the research performed by the young researchers, PhD students and junior fellows. They will greatly enhance the research capacity in quantum technology. Imperial College has many leading engineers and quantum scientists. One of the important outcomes we expect through this Hub programme is for these academics to work together to translate the revolutionary ideas in quantum science to engineering and the market place. We also aim to influence industry and policy makers through our outreach programme in order to improve their awareness of this disruptive technology.


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Studentship Projects

Project Reference Relationship Related To Start End Student Name
EP/P510257/1 01/04/2016 31/12/2022
2012656 Studentship EP/P510257/1 01/10/2017 30/09/2018 Konstantinos TSOUKALAS