| EPSRC Reference: |
GR/L52529/01 |
| Title: |
OPTICALLY PUMPED TERAHERTZ EMMITTERS |
| Principal Investigator: |
Kelsall, Professor RW |
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| Department: |
Electronic and Electrical Engineering |
| Organisation: |
University of Leeds |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 July 1997 |
Ends: |
30 June 1999 |
Value (£): |
77,156
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| No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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Emission form quantum well intersubband transitions in n-type GaAs/AlGaAs and GaInAs/AlInAs structures will be harnessed to generate radiation in the range of 1-8thz (300-40 microns). Devices operating in this frequency range promise an intrinsic advantage in that the intersubband separation is less than the LO phonon energy, thus implying suppression of non-radiative (phonon-mediated) transitions. Population inversion will be generated by intersubband or interband optical pumping, which allows use of relatively simple layer structures, and avoids difficulties with tunnelling-mediated electron injection and free carrier absorption. A realistic device simulator will be developed, using an ensemble Monte Carlo method, which will give picosecond resolution of the carrier dynamics, including a microscope description of all relevant carrier phonon and carrier-carrier scattering processes, thus enabling device optimisation to maximise population inversion and quantum efficiency. Intersubband energy levels and lifetimes will be measured by FIR absorption and free electron laser spectroscopy (at the FELIX facility in Holland), and used to validate the simulation model. Continuous feedback of experimental and simulation results will be maintained to optimise the layer design and device geometry. Devices will be monitored for terahertz radiation emission using spectrometer systems with sub-nanowatt sensitivity.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.leeds.ac.uk |