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Bennett Lab Cardiff

Compound Semiconductor Quantum Photonics

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I have been at Cardiff University for 5 years. This month we welcome Elena from Turin to Cardiff for a secondement in the LasIonDef project. Here is Elena and project leader Prof Shane Eaton listening to presentations from all the partners of the project across the EU. I have published a new paper in collaboration with the group of Prof Jon Finley in TU Munich. It is great to finally see this one in print. The paper is about two-photon interference of single photons from dissimilar sources, for example semiconductor quantum dots and silicon vacancies in diamond. It contains the longest equation of any publication I have been involved in (swipe left if you want to see it). We have an open PhD position to join our group in 2023. If you, or anyone you know is interested in working with quantum photonics, semiconductors and Technology, please do get in touch. Find out more at https://www.findaphd.com/phds/project/developing-semiconductor-quantum-light-sources/?p149068 We have published a new paper on a method of collecting the photons trapped in a semiconductor that would normally be totally internally reflected by the surface. We show that in aluminium nitride this can increase the number of photons collected by a factor of 4.2. For more information visit: New Journal of Physics 24 103027 (2022) https://iopscience.iop.org/article/10.1088/1367-2630/ac9697. Our new paper on designing free-space couplers for suspended triangular nano-beam waveguides has been published at https://doi.org/10.1088/1361-6463/ac941e. Triangular waveguides are sometimes used to create nanophotonic devices in diamond, glasses and gallium nitride, where they can be easier to fabricate than conventional rectangular waveguides. A major challenge is coupling light into, and out of, these devices. We present surprisingly high efficiencies from some unusual designs of coupler that should be easy to fabricate in the near future. Today I got to visit the new microscopy labs on the floor below my office. This is the star of the show: a 3 meter tall scanning tunneling electron microscope with 0.6 angstrom resolution. Wow. At a training event today on delivery of educational school workshop on semiconductors 'Generation Tech', which we have been working on with #sciencemadesimple. Looking forward to seeing this roll out to local schools very soon. Here is one of the exercises about pixellation and imaging: can you recognise these #bennettlabcardiff researchers? New lab! These photos were taken over 5 days as we moved 1 mile north to the new facility. Thanks to all the group for their hard work.

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