Intersubband Light Emission Type II Heterostructures
Abstract
We have studied the physics underlying some of the pending issues in quantum cascade lasers, with an emphasis on electronic transport across InAs/AlSb/GaSb 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 2003
- Accession Number
- ADA422315
Entities
People
- Emillo E. Mendez
Organizations
- State University of New York