Quantum Transport Modeling of Interband Cascade Lasers (ICL)
Mid-infrared semiconductor lasers with a wavelength between 3 and 6 �m play a critical role in telecommunication and optical disc applications, for example. They require materials with a very low band gap that are rather difficult to find. To address this issue, quantum cascade lasers (QCL) were invented in 1994. The idea consists of taking advantage of intersubband electron-hole recombinations within the conduction band of well-engineered superlattices. As room-temperature operations of QCL are typically challenging to achieve, interband cascade lasers (ICL), as illustrated below, were proposed. They rely on conduction-to-valence band carrier recombinations using type-II heterostructures. Thanks to longer electron and hole lifetimes, they could theoretically consume less power than QCL. However, no high-performance ICL has so far been demonstrated.
The Big Picture
The goal of this project is to simulate interband cascade lasers based on the InAs-GaInSb material system with an in-house quantum transport solver called OMEN and to determine their performance limit. To accurately model the required bandstructure, the empirical tight-binding (TB) method will be used. This will require first creating TB parameter sets for the missing materials. Next, superlattices similar to that shown below will be constructed before simulating their transport characteristics at the quantum mechanical level. Light-matter interactions will be accounted for to validate the chosen simulation approach and assess the efficiency of the investigated ICL design.
- Looking for 1 master or semester student
- Interested candidates please contact: Manasa Kaniselvan
Interest in quantum transport theory and nano-device modeling.
Type of Work
- Theory (30%), model development (20%), simulation & analysis (50%)