Details of Grant 

EPSRC Reference:	GR/S41111/01
Title:	Single-cycle pump-probe spectroscopy of intersubband processes in semiconducting materials and devices
Principal Investigator:	Johnston, Professor MB
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department:	Oxford Physics
Organisation:	University of Oxford
Scheme:	First Grant Scheme Pre-FEC
Starts:	10 July 2003	Ends:	09 July 2006	Value (£):	120,187
EPSRC Research Topic Classifications:	Lasers & Optics Materials Characterisation
EPSRC Industrial Sector Classifications:	Communications Electronics No relevance to Underpinning Sectors
Related Grants:
Panel History:
Summary on Grant Application Form
This proposal descibes an investigation into the ultrafast dymanics of intersubband electronic transitions in semiconductor devices. Intersubband based devices, which include the quantum-well infrared photodetector (QW I P) and quantum cascade laser (QCL), have the potential to become the tools for a new generation of high speed communications and electronic devices. A sophisticated coherent time domain spectrometer will be developed to enable the study of intersubband dynamics of thes devices on a femtosecond time-scale. The spectrometer will produce single-cycle pulses of radiation encompassing the far and mid-infrared regions of the spectrum, based on technology which I have recently developed. This spectrometer will also form a foundation for establishing my research within the Clarendon Laboratory. The QCL structure provides a perfect system for studying fundamental quantum kinetic phenomena of electrons in an intersubband system. The temporal resolution of the spectometer proposed herein will allow the direct observation of these processes. Intersubband lifetimes of QCLs will be measured providing data for improved device deisgn and modelling. Measurements of the dymanics of conventional QW IPs will provide an insight into the ultimate speed of these detectors, and into the performance of novel intermixed QW Ps. Finally, exploratory measurements will be performed to establish the suitability of single-cycle pump-probe spectroscopy for studies in bionanotechnology, structural biology and soft condensed matter physics.
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Organisation Website:	http://www.ox.ac.uk