Intersubband Light Emission Type II Heterostructures
Final rept. 1 Jul 1999-30 Jun 2003
STATE UNIV OF NEW YORK AT STONY BROOK
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We have studied the physics underlying some of the pending issues in quantum cascade lasers, with an emphasis on electronic transport across InAsAlSbGaSb heterojunctions - the building block of type II quantum cascade lasers - and on its dependence on the materials epitaxial growth conditions. We have used sonant tunneling experiments to confirm the coexistence of electrons and holes in separate InAs and GaSb layers, to determine their density and to correlate them to interface smoothness and optimum growth conditions. We have also examined the effectiveness of a superlattice placed on the collector end of a type I tunneling heterostructure device to block tunneling through the potential barrier. Finally, we have studied the interaction of photons and excitons in type I microcavities and have devised a simple way of enhancing the coupling between photons and excitons.
- Inorganic Chemistry
- Electrical and Electronic Equipment