MIOMD-XI Speakers    
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1.  Mr. Abdullah Aldukahyel, University of Surrey, UK
Poster: The influence of inter-valley scattering on λ∼3.7 μm InGaAs/AlAs(Sb) quantum cascade lasers.
Speaker Biography: Abdullah Aldukhayel is a PhD research student working in the Advanced Technology Institute at the University of Surrey. Current interests include the development of semiconductor lasers for sensing and free-space communications. His undergraduate and master degrees were obtained from the King Saud University in Saudi Arabia who are currently sponsoring his PhD project.

Summary: Semiconductor lasers emitting in mid infra-red region are of increasing interest owing to their use in wide range of applications. One of the important applications is a sensor for monitoring gases such as CO2, SO2 and CH4. This requires inexpensive, room temperature and reliable mid-infrared light emitting devices. Despite significant advances in conventional long wavelength inter-band lasers, their performance remains limited by large losses due to non-radiative Auger recombination and inter-valence band absorption which are fundamental processes in narrow band gap III-V material systems. In the 3-4µm region, quantum cascade lasers (QCLs) can potentially be used as a solution to overcome Auger recombination which limits the performance of standard inter-band lasers. They can also be grown on more readily available substrates, such as InP which reduces their cost and eases manufacture. Since the transition occurs between two confined electron levels in the conduction band, a large conduction band offset is required to provide a short emission wavelength. Large separations between the Γ and indirect L- and X- valleys are also needed to avoid inter-valley scattering processes which may deteriorate the performance of QCLs.
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