Blue microcavity lasers based on gallium nitride

​No attempts to develop ultrasmall lasers emitting blue light have been really successful. The two most critical building blocks – the electron pump that provides the energy to create new photons and the mirrors that recycle the photons – have proven very difficult to realize. In this project new strategies will be tested, which includes a new type of superresponsive mirror which has a “knock-out” effect on the light. For the electron pump new materials which easily transport both photons and electrons will be tested; also, selective destruction of a material will be used to create paths for the electrons without having to use a different material for the isolating surroundings.

The goal is to increase the energy efficiency of blue lasers by a factor of ten, at least, and achieve a lifetime and reliability that is comparable to the robust microlasers emitting infrared light that are used in optical fiber communication. This is quite a challenge: typical lifetimes of demonstrated blue microlasers have been only a few minutes. One of the first applications of these lasers would be in biomedical detection, since biomolecules often interact strongly with light at these wavelengths. 

Project leader
External partners

​École Polytechnique Fédérale de Lausanne (EPFL), Switzerland and Politecnico di Torino, Italy.

​Swedish Research Council (VR)

Chalmers University of Technology, centrally and through Area of Advance Nanoscience and Nanotechnology

Knut and Alice Wallenberg (KAW) Foundation

Hasselblad Foundation

Published: Tue 03 Dec 2013.