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Tunable optical resonators with embedded diamond defect centres for quantum technologies

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  • Full or part time
    Dr Michael Strain
  • Application Deadline
    No more applications being accepted
  • Funded PhD Project (European/UK Students Only)
    Funded PhD Project (European/UK Students Only)

About This PhD Project

Project Description

Defect centres in diamond have shown potential for a wide range of applications in sensing, metrology and quantum optics. In particular nitrogen and silicon vacancies have been exploited as nanoscale magnetometers, quantum memories and single photon emitters. The efficiency of such optical devices is dependent on the light-matter interaction, the effects of which can be improved by embedding the defect centre in a resonant cavity. The cavity enhances both the optical field strength on-resonance and the spatial overlap of the optical mode and defect centre. Improvements in defect centre creation and micro-optic fabrication have allowed the systematic creation of defect centres within free space and guided wave resonator structures.
One of the major challenges in the use of optical resonators is in matching the resonant wavelength of the device with the wavelength of the defect centre embedded in it. Free space designs have the advantage of being able to modulate the physical cavity length via mechanical actuators, though there are significant barriers to scaling of these setups for multi-node systems or compact point of use sensors. On the other hand, although guided wave resonators present extremely compact device footprints, it has proven extremely difficult to tune the resonant wavelength of these devices in diamond optical devices.
This project will develop means by which high Q-factor diamond optical resonators can be tuned to overlap with embedded defect centres. A number of parallel methods will be explored, including: heterogeneous integration of electro-optical materials, local thermal tuning of thermally isolated resonator devices and direct electronically doped diamond. Devices will be realised in-house at the Institute of Photonics in Strathclyde and the student will undertake design, fabrication and measurement activities.

The Centre for Doctoral Training in Diamond Science and Technology:
The Diamond Science and Technology (DST) Centre for Doctoral Training (CDT) is one of the newest CDTs funded by EPSRC and industry, and has diamond based research at the core of all activities. The DST involves a consortium of eight UK universities (Warwick, Aberystwyth, Bristol, Cardiff, Imperial, Newcastle, Oxford, and Strathclyde) and over thirty companies, keen to exploit the vast potential of diamond, along with many international partners. Diamond research projects will span a range of different themes including electronics, measurement and sensing, photonics, quantum, nuclear, water, manufacturing and new physical sciences for healthcare. There will be an intake of twelve students per year. Students are funded for four years and in Year 1 will undertake a purpose designed MSc in Diamond Science and Technology based at Warwick University, but taught by academics from partner universities and industry. As part of the MSc students will undertake two, ten week mini-projects at two different universities (or industrial partner(s)), which link to the theme of their chosen PhD. The PhD takes place in Years 2-4 at one of the eight universities.

Mini Project Supervisors:
Dr. Joshua Nunn; University of Oxford
Dr. David Moran; University of Glasgow

Applications
Application submission is a two-step process. You must apply to BOTH Warwick for the MSc using the Warwick Online Application form – state MSc in Diamond Science and Technology – and your host institution for PhD studies. Further information can be provided by contacting [email protected]



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