Details of Grant 

EPSRC Reference:	GR/N05178/01
Title:	MID INFRA RED APPLICATIONS FOR SEMICONDUCTOR QUANTUM DOTS
Principal Investigator:	Cockburn, Professor J
Other Investigators:	Mowbray, Professor D Skolnick, Professor M Cullis, Professor AG
Researcher Co-Investigators:
Project Partners:
Department:	Physics and Astronomy
Organisation:	University of Sheffield
Scheme:	Standard Research (Pre-FEC)
Starts:	13 January 2000	Ends:	12 July 2002	Value (£):	71,758
EPSRC Research Topic Classifications:	Materials Characterisation
EPSRC Industrial Sector Classifications:	No relevance to Underpinning Sectors
Related Grants:
Panel History:
Summary on Grant Application Form
We propose an investigate of the physics, materials growth and device engineering issues associated with the development of mid infrared (MIR) devices based on intersub-level transitions in self organised InAs quantum dots. The unique, zero-dimensional properties of quantum dots (QDs, provide such devices with the potential to exhibit significantly enhanced performance relative to current structures based on intersub-band transitions in quantum wells (QWs). In particular the greatly decreased non-radiative intersub-level scattering rate in QDs provides a basis for unipolar IR lasers with lower threshold currents than QW-based quantum cascade lasers, and IR detectors with higher detectivity and better thermal characteristics than QW infra red photodetectors. Furthermore, the relaxation of intersub-level polarization selection rules expected in QDs leads to the possibility of surface-emitting intraband IR sources, and detectors sensitive to normal incidence radiation. Our experimental work will centre on FTIR studies of MIR absorption and emission in QDs, carried out in research and strucutreal and compositional analysis. We expect that in addition to providing the basis for IR device designs, these experiments will yield significant new information on QD electronic structure, intraband relaxation and carrier transport in QD systems.
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Organisation Website:	http://www.shef.ac.uk