| EPSRC Reference: |
GR/L60890/01 |
| Title: |
MID-IR PICOSECOND LASER STUDIES OF INTER-SUBBAND CARRIER DYNAMICS IN LOW-DIMENSIONAL SEMICONDUCTORS |
| Principal Investigator: |
Phillips, Professor C |
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| Department: |
Physics |
| Organisation: |
Imperial College London |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 August 1997 |
Ends: |
31 January 2001 |
Value (£): |
203,141
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| No relevance to Underpinning Sectors |
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Summary on Grant Application Form |
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There are four scientific themes, all relying on the unique output (two 70 ps 1MW pulses, independently tunable from 3-18 microns) of a home built OPG laser which matches most inter-subband transitions in quantum wells and dots. Working with Sheffield and AT+T Lucent, saturation and hole-burning measurements will be made to identify dominant intersubband scattering processes and rates, both crucial to the performance of Quantum Cascade lasers. The importance of the hitherto unrecognised electron-electron contribution to intersubband scattering will be quantified. Subband transitions of laterally confined O-D InAs dots will be sought for the first time.Giant subband-resonant IT harmonic-generation and frequency-mixing will be studied, using our new waveguide dispersion compensation method to give record IR conversion efficiencies of several 10s of percent. Structured contact patterns will be studied for periodically-poled mixing devices and photonic bandgap structures.MBE In(As, Sb) superlattice mid-IR LEDs and laser diodes are a local speciality. OPG pump-probe studies will evaluate the bandstructure engineering methods use to surpress the undesirable Auger recombination currently preventing ambient temperature mid-IR laser diodes.
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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.imperial.ac.uk |