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Details of Grant 

EPSRC Reference: GR/N23219/01
Title: DEVELOPMENT OF ALL-OPTICAL HIGH POWER TERAHERTZ SOURCES
Principal Investigator: Linfield, Professor EH
Other Investigators:
Davies, Professor AG Johnston, Professor MB Pepper, Professor Sir M
Ritchie, Professor DA Barnes, Professor C
Researcher Co-Investigators:
Project Partners:
Toshiba
Department: Physics
Organisation: University of Cambridge
Scheme: Standard Research (Pre-FEC)
Starts: 30 January 2001 Ends: 29 June 2004 Value (£): 217,365
EPSRC Research Topic Classifications:
Materials Characterisation Materials Synthesis & Growth
EPSRC Industrial Sector Classifications:
No relevance to Underpinning Sectors Electronics
Related Grants:
Panel History:  
Summary on Grant Application Form
We will develop a high power, all-optical pulsed source of coherent Thz radiation. Such sources are potentially of considerable importance for coherent imaging (eg in the dental, medical and electronics industries) and spectroscopy (eg for environmental monitoring). The ultimate goal is routine generation of coherent THz radiation approaching mW power levels using novel semiconductor structures.Our unique MBE facility provides us with distinct opportunities to tailor the electronic band structure ina range of semiconductor heterostructures. We will optimise the electric field profile and material characteristics responsible for the surface emission generation of THz pulses using excitation with sub-100fs pulses of visible light. Our principal aim will be to investigate and exploit the dramatic surface emission enhancement in a magnetic field, which we have recently identified.The high power sources obtained will form the foundation for a coherent imaging and spectroscopy system. Pixel-by-pixel time and frequency dependent spetra will be obtained, allowing the construction of compositional images. We will specifically investigate the contrast mechanisms obtained in two demonstrator medical projects.
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Organisation Website: http://www.cam.ac.uk