Akshay Balgarkashi E-mail: akshay.balgarkashi@epfl.ch Phone: +41 (0)21 69 37324 Institution: Ecole Polytechnique Fédérale de Lausanne supervisor: Anna Fontcuberta i Morral

 

Project Title: Double photonic structure with a quantum dot in a nanowire (WP4)

We will include quantum emitters in the nanowire structures for a bright and coherent emission. We will tune the two photonic components of the system: i) the nanowire cavity/waveguide via morphology design and ii) nanoscale alloy segregations as quantum emitters. Growth conditions and compositions leading to bright and coherent emission at or close to room-temperature will be investigated at EPFL. We will tune the spectral range of emission as a function of the growth conditions and heterostructure design. The morphology of the nanowire will also be carefully tuned to ensure optimal photon extraction. The photonic design and quantum photonic properties of the structures will be evaluated at UTT.
Akshay will divide his research time between EPFL and UTT depending on the status of the project (growth and basic characterization at EPFL, advanced photonic characterization at UTT).

Expected Results: Achieving emission of the QDs at a high photon rate and with a reduced linewidth. Ultimate understanding of self-segregation of Ga and In in InxAlyGa1-x-yAs as a source of QDs and prediction of the process in other alloy systems. Most importantly we want to find the growth conditions and compositions
leading to bright and coherent emission at or close to room-temperature.

 

EPFL = Ecole Polytechnique Fédérale de Lausanne
UTT = Université de Technologie de Troyes

 

Articles and reports:

– Report on secondment

– Article published in Journal of Optics (2020)
– Article published in Nano Letters (2019), preprint
– Article published in ACS Nano (2019)