Article Published: Self-Assembled QD Crystals

Our latest research article on the optical properties of self-assembled quantum dot crystals has just been published as an Accepted Manuscript in the Journal of Materials Chemistry C.

https://pubs.rsc.org/en/content/articlelanding/2018/tc/c8tc04780d#!divAbstract

This research was undertaken as part of our collaborative work with ITMO University, St Petersburg, Russia. In this paper, quantum dot (QD) self-assembly into ordered superstructures has been analysed, along with the evolution of their morphological and optical properties. QD self-assembly occurs through two distinct stages (homo- and hetero-geneous), leading to the formation of supercrystals with a layered morphology. Analysis of the optical properties throughout the superstructures’ growth has shown that the absorption and photoluminescence (PL) bands are blue shifted, retaining almost the same PL lifetimes as in the initial QD solution. The supercrystals formed possess a further unique optical property caused by their layered morphology; namely, a four-fold symmetry characterized by strong birefringence. Such supercrystals may be used for the fabrication of microscale optical paths with high extinction coefficients and specific polarization properties for novel optoelectronic devices.

Photonic Crystal Resonators – Article Published

Exciting new research from the Baldycheva Laboratory is now freely available to read.

Joaquin Faneca et al. have recently had their paper accepted for publication in the peer-reviewed journal Frontiers in Physics. The paper, titled ‘One-dimensional Multi-channel Photonic Crystal Resonators based on Silicon-On-Insulator with High Quality Factor‘, describes exciting developments in Fabry-Pérot resonator cavities, with tuneability provided by liquid crystals.

Devices were designed and tested to produce exceptionally high quality factor resonances. The resonances  could then be split further, increasing the quality factor, by tuning with microfluidically integrated liquid crystals.

The published research opens up new possibilities in silicon photonics, a technology that promises to revolutionise the future of computing globally, and refractive index sensing, which- for example- could lead to advances in medical diagnostics.

This international work was produced from the collaboration between researchers in:

  • The Baldycheva laboratory
  • The EPSRC Centre for Doctoral Training in Electromagnetic Metamaterials at the University of Exeter
  •  Trinity College, Dublin, Ireland
  • Saint Petersburg State University of Information Technologies, Mechanics and Optics, Russia
  • Ioffe Institute (RAS), Russia

The paper has been distributed with open-access.

Correspondence regarding this research should be addressed to:

Prof. Tatiana S. Perova, Trinity College, Dublin: perovat@tcd.ie
Prof. Anna Baldycheva, University of Exeter: a.baldycheva@exeter.ac.uk