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Details of Grant 

EPSRC Reference: GR/N23516/01
Title: GAINP/ALGAINP QUANTUM DOT LASERS
Principal Investigator: Houston, Professor P
Other Investigators:
Mowbray, Professor D Cullis, Professor AG
Researcher Co-Investigators:
Project Partners:
Department: Electronic and Electrical Engineering
Organisation: University of Sheffield
Scheme: Standard Research (Pre-FEC)
Starts: 01 October 2000 Ends: 30 June 2004 Value (£): 144,342
EPSRC Research Topic Classifications:
Optoelect. Devices & Circuits
EPSRC Industrial Sector Classifications:
Electronics No relevance to Underpinning Sectors
Related Grants:
GR/N21888/01
Panel History:  
Summary on Grant Application Form
The aim of the project is to develop short wavelength quantum dot lasers for operation at the technologically important wavelengths in the red part of the spectrum. This will make use of a new quantum dot material system of GaInP growth in AlGaInP. A complimentary aim is to gain further insight into the physics of low-dimensional solids as applied in semiconductor lasers and produce a detailed model of GaInP/AlGaInP quantum dot lasers to allow design optimisation for further applications.Although conventional quantum well lasers operating between 690 and 630nm have many applications (including optical information storage, plastic fibre communication and photodynamic therapy), their use is restricted by high threshold currents, large temperature sensitivity and small differential gain. Although progress has been made by careful optimisation of device designs the prospect of using quantum dot structures in the GaInP material system, suggested by recent work in Cardiff, offers an opportunity to attack these limitations at a more fundamental level. Material grown by the Stranski-Krastanov process also extends the upper wavelength limit beyond that obtainable with GaInP quantum wells. This larger range encompasses wavelengths of interest for photodynamic therapy that lie between those currently available using GaInP (<690nm) and GaAs (>740nm).
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Further Information:  
Organisation Website: http://www.shef.ac.uk