MIOMD-XI Speakers    
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1.  Prof. Roland Teissier, Université Montpellier 2, FRANCE
Invited Talk: Long wavelength InAs/AlSb quantum cascade lasers
Speaker Biography: We propose to explore the potential of InAs-based quantum cascade lasers to operate in the far infrared up to the THz spectral region. The fundamental advantage of this solution is the small electron effective mass in InAs, 0.023m0 compared with 0.067m0 in GaAs. This small effective mass should provide much higher optical gain and thus lower thresholds in long wavelength InAs-based QCLs, which should result in significant improvement of their performances. We will present here our preliminary work in this direction. We developed a process for the fabrication of double metal waveguide (DM), suitable for long wavelength and THz lasers. We designed and fabricated far infrared InAs/AlSb quantum cascade active regions using molecular beam epitaxy. A first important result is the demonstration of DM QCLs emitting up to λ=21 μm (υ=15 THz).

Summary: Roland Teissier graduated from Ecole Normale Supérieure in Paris. He got a PhD in the field of the physics of semiconductor heterostructures in 1992. He has been studying the physics and technology of a large variety of opto- or micro-electronics devices, first as Research Associate at University of Sheffield, UK, and as CNRS researcher in Paris, France. He joined the IES (Institut d’Electronique du Sud) laboratory at the University of Montpellier in 2001 where he is working now as CNRS Directeur de Recherche. His main research interests are InAs/AlSb quantum cascade lasers and InAs-based hot electron transistors. He is author of about 80 scientific publications and 10 invited talks at international conferences.
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