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.
Organisations
Publications
Lee, El-Hang; Eldada, Louay A.; Jagadish, Professor Chennupati; Razeghi, Manijeh
(2010)
VLSI micro- and Nanophotonics: Science, Technology, and Applications
Hutchings M
(2011)
Temperature dependence of the gain peak in p-doped InAs quantum dot lasers
in Applied Physics Letters
Ferguson J
(2011)
Optical Gain in GaInNAs and GaInNAsSb Quantum Wells
in IEEE Journal of Quantum Electronics
Al-Ghamdi M
(2011)
Dot Density Effect by Quantity of Deposited Material in InP/AlGaInP Structures
in IEEE Photonics Technology Letters
Sobiesierski A
(2011)
Comprehensive Semiconductor Science and Technology
O'Driscoll I
(2012)
Effect of proton bombardment on InAs dots and wetting layer in laser structures
in Applied Physics Letters
Finch P
(2013)
Femtosecond pulse generation in passively mode locked InAs quantum dot lasers
in Applied Physics Letters
Elliott S
(2015)
Manufacturing-tolerant compact red-emitting laser diode designs for next generation applications
in IET Optoelectronics
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 | 05/2013 |
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 | 04/2013 |
Description | Impact Acceleration Account |
Amount | £56,299 (GBP) |
Funding ID | EP/503988/1 |
Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
Sector | Public |
Country | United Kingdom |
Start | 10/2013 |
End | 09/2014 |