Platform Renewal - Optical gain and recombination in structured materials

Lead Research Organisation: Cardiff University
Department Name: School of Physics and Astronomy

Abstract

This proposal is to support a group activity based on excellence and unique capabilities in the measurement of fundamental optical processes in materials and device structures. We aim to achieve deeper understanding of the physics of light-matter interactions, embracing colloidal and biological systems, and to enable advances in device concepts to be made, particularly by integration of functional and structured materials, and integration with living systems.This activity is strongly linked, in two way interactions, to a series of intermediate and end users ensuring relevence and that our work benefits the wider community.

Publications

10 25 50
 
Description We have experimentally demonstrated and modelled the transition from a fully random distribution of carrier in a coupled quantum dot - wetting layer system at 20K through a non-thermal distribution at intermediate temperatures to a fully thermal distribution above room temperature.
We have demonstrated that the associated gain spectrum width controls and is the limiting factor in pulse duration in modelocked lasers fabricated from this material
We have demonstrated the degree to which carrier lifetime is affected by proton bombardment and demonstrated this as a way of optimising the recovery time of a saturable absorber in an integrated mode locked laser.
We have explained the origin of the temperature dependence of threshold current density in quantum dot lasers.
We have measured the ambipolar diffusion length in active quantum dot material.
We have demonstrated deep etched gratings and their use as reflectors in the GaInP / AlGaInP system
Exploitation Route Improve the performance of short pulse lasers and integrated systems at high temperature.
As a whole this work illustrates the advantages and parameter space of these quantum dot materials for use in the further integration of optoelectronics and more highly functionalised devices and points towards the possibility of the future integration of photonics and silicon based electronics.
Sectors Digital/Communication/Information Technologies (including Software),Healthcare

 
Description Device designs used as generic structures for customers wanting to try out quality
First Year Of Impact 2009
Sector Manufacturing, including Industrial Biotechology
Impact Types Economic

 
Description Cardiff University
Amount £25,251 (GBP)
Funding ID Cardiff Partnership fund 
Organisation Cardiff University 
Sector Academic/University
Country United Kingdom
Start 05/2012 
End 04/2013
 
Description Cardiff University
Amount £25,251 (GBP)
Funding ID Cardiff Partnership fund 
Organisation Cardiff University 
Sector Academic/University
Country United Kingdom
Start 05/2012 
End 05/2013
 
Description Impact Acceleration Account
Amount £56,299 (GBP)
Funding ID EP/503988/1 
Organisation Engineering and Physical Sciences Research Council (EPSRC) 
Sector Academic/University
Country United Kingdom
Start 10/2013 
End 09/2014