Material Engineering Novel Semiconductor Structures
Abstract
This research has focused on using the methods of 'band-gap engineering' to improve various electronic and optical properties of materials. From an experimental point of view, it has achieved the capability of routinely performing photoluminescence, photoconductivity and photoluminescence excitation measurement at the JHU faciltites. Among the most important theoretical results are advances in intersubband lasers and raman oscillators, especially a new "inverted effective mass" scheme. A theory of optical generation of THz radiation in bulk semiconductors and QW's has been developed to explain the experimental results of other groups. A major achievement has been the development of a rigorous theory for a group of phenomena commonly known as 'lasing without inversion'. For the first time we have developed expressions for threshold and slope efficiency and have come to conclusion that at least for our case of interest-quantum-confined semiconductor structures 'lasing without inversion' does not offer any advantage over more conventional schemes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1997
- Accession Number
- ADA331656
Entities
People
- Jacob B Khurgin
Organizations
- Johns Hopkins University