New Paper: Heterostructure and Q-factor engineering for low-threshold and persistent nanowire lasing

Group PhD student Stefan Skalsky’s paper on semiconductor nanowire lasing has just been published in Light: Science and Applications. In this new work, Stefan used his newly developed Interferometric Time-Correlated Single Photon Counting system (i-TCSPC) to measure the coherence length of laser emission from nanowires grown by the Liu group at UCL. These measurements allowed the direct calculation of the nanowire mirror reflectivity.

During this study, Stefan found that it was possible to use indirect bandgap materials as a holding state for carriers before they relax into the emissive wells; this finding both allows multi-nanosecond lasing after a sub-picosecond excitation, and record low lasing thresholds through resonant excitation.

This work was supported by TEM provided by the Sanchez group at Warwick.

Reference: Heterostructure and Q-factor engineering for low-threshold and persistent nanowire lasing, Skalsky et al., Light: Science and Applications, 9, 43 (2020) https://doi.org/10.1038/s41377-020-0279-y

PhD Viva: Arturo

Arturo Alanis (the first PhD student of the group) had a successful PhD viva today. His thesis examiners were Dr Hannah Joyce (Cambridge) and Dr Jessica Boland (Manchester).

Arturo has already secured a postdoctoral position to start in a few weeks; we’ll be sad to see him go, but wish him the best for his future beyond Manchester and the North West! Over the past four years Arturo has built much of the experimental tools and techniques for our work on nanowires and nanowire lasers – as well as dealing with lab moves and teaching.

All the best to Arturo on the next stage of his career!

Photonics West 2020 – presentation and proceedings

The talk and proceedings for Patrick’s recent invited talk at Photonics West is now available online.

A needle in a needlestack” describes how our recent work on Manchester on inhomogeneity can provide more information about functional performance than a homogeneous population can.

Reference: A needle in a needlestack: exploiting functional inhomogeneity for optimized nanowire lasing , Proc. SPIE 11291, Quantum Dots, Nanostructures, and Quantum Materials: Growth, Characterization, and Modeling XVII, 112910K (2 March 2020) https://doi.org/10.1117/12.2558405