PhD defence by Aurimas Sakanas

Title: Buried Heterostructure Photonic Crystal Lasers

Principal supervisor: Associate Professor Kresten Yvind
Co-supervisor: Professor Jesper Mørk
Co-supervisor: Senior Researcher Elizaveta Semenova

Evaluation Board
Søren Stobbe, Associate Professor, Fotonik, Denmark
Johan Peter Reithmaier, Professor, University of Kassel, Germany 
Kirsten E. Moselund, Manager Materials Integration and Nanoscale Devices Group. Expert nanoscale epitaxy, IMB Zürich, Switzerland

Master of the Ceremony

Assoc. Prof. Martijn Wubs


Growing interest in integrated optical communications and data processing applications drives the development of ultra-small and energy efficient on-chip photonic components. High-performance small-footprint laser integrated on silicon is one of the key ingredients in this scheme. As a part of an entire photonic crystal platform for realizing components with required functionalities, lasers based on photonic crystal cavities stand out as rapidly progressing technology. Majority of demonstrations utilize photonic crystal lasers where the active material is extending across the entire device region. Such structure is far from optimal as heating and absence of carrier confinement degrade device characteristics. The buried heterostructure concept, well-known in semiconductor lasers technology, can be implemented with the photonic crystals and address the critical requirements for on-chip applications: device operating speed, output power and energy consumption. This thesis has focused on the development of buried heterostructure photonic crystal lasers. Due to small buried heterostructure dimensions, critically important fabrication steps are: highly controllable material etching, material re-growth processes and an accurate alignment to embed the active material into the photonic crystal cavity. Combined all together, high performance optically-pumped quantum well lasers are realized. Among them the buried heterostructure Fano lasers are demonstrated for the first time ever. The buried heterostructure photonic crystal lasers on Si platform promise exciting opportunities in the future for novel device design demonstrations as well as for photonic integrated circuits applications.


tir 02 apr 19
13:30 - 16:30


DTU Fotonik



Lyngby Campus
Building 341, Auditorium 22