Optical Properties of Heterostructures and Superlattices.
Abstract
The project for the study of the optical properties of single and multiple quantum wells involved both experimental and theoretical studies of such heterostructures. This study has utilized a variety of optical techniques such as laser excited luminescence, photoreflectance, laser emission with and without magnetic fields. The initial experiments which were conducted on a single quantum well of GaAs/GaAlAs structure led to an interesting discovery and explanation of exciton transport at low excitation intensities at a critical range of temperatures. The second class of experiments involved high intensity laser excitation which led to the discovery of a new lower high density excitonic state below the lowest exciton when under moderate excitation. The identification of this new state was facilitated by the use of high magnetic fields. A corollary to this experiment was the observation of the electron-hole plasma state at the highest intensities. This occurs at still a lower energy and was shown tol be the source of stimulated emission in a quantum well.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1988
- Accession Number
- ADA191542
Entities
People
- Benjamin Lax
Organizations
- Massachusetts Institute of Technology