Online PhD defence by Larissa Vertchenko

Title: Near-zero index materials for low loss integrated photonics

Principal supervisor:  Assoc. Prof. Andrei Lavrinenko
Co-supervisor: Assoc. Prof. Nika Akopian

Evaluation Board
Reader (Assoc. Prof) Andrea Di Falco, St. Andrews University, UK
Prof. Sergey L. Bozhevolyi, Syd Dansk Universitet, Denmark

Prof. Jesper Mørk, DTU Fotonik, Denmark

Master of the Ceremony
Senior Researcher Radu Malureanu, DTU Fotonik, Denmark

The need of miniaturization and faster electronic devices resulted in the rise of photonics, with the big promise of light circuits with low heating. Then, new challenges have arisen, therefore exploring new exotic materials is the key to overcome them. In this thesis we describe a particular class of materials, named near-zero index materials. Their peculiar electromagnetic properties, such as enlargement of the wavelength, show great potential for enhancing transmission of a signal inside photonic waveguides. Besides, their constant phase property finds great applications in the field of quantum photonics, where information generated by quantum emitters can be preserved instead of degraded by the environment, causing decoherence. However their realization still remains a challenge, as it requires very specific geometries to fulfil some requirements related to the effective medium theory.

The first part of this PhD project is composed of a theoretical foundation where we present novel possibilities and challenges of integrating such a materials with quantum emitters. In the next part we investigate potential plasmonic materials that could exhibit such low-index behaviour and show their experimental characterization and possible applications. The last part of the project includes design and experimental verication of a dielectric low-index material in a photonic crystal environment. We also explore the combination of near-zero index modes with bound states in the continuum (BIC) as a way to suppress radiative losses on-chip. Finally, we discuss the prospects of such combination and their great potential for photonic circuitry.

Register to join
Please write to Susanne Kolodziejczyk to register.


Tue 19 May 20
13:30 - 16:30


Online. Please write to Susanne Kolodziejczyk to register.