Optical spectroscopy of intact and intermixed gallium arsenide/aluminum arsenide superlattice structures.
Published: 2006
Language: eng
Number of pages: 154
ISBN-13: 9780494211403
Description: Raman and PL optical spectroscopy are developed to characterize QWI in GaAs/AlAs SL devices, including bandgap gratings for quasi-phase matching (QPM). The phonon dispersion in ideal GaAs/AlAs SL is calculated and the effects of intermixing are examined. Optimization of the Raman measurement is discussed and as-grown, large-area intermixed, and bandgap grating samples produced from 14:14 GaAs/AlAs SL are characterized. PL measurement confirmed the predicted bandgap from bandstructure calculation and revealed the presence of complete or incomplete intermixing. Raman measurement profiles indicated the SL width, the modulation along the intermixed grating, and the degree of intermixing in large-area samples. In edge-measurement, the GaAs IF modes offer the best SNR between intact and intermixed material followed by the GaAs-like TO peak position and the peak intensities of the TO modes.
Notes: Source: Masters Abstracts International, Volume: 45-03, page: 1615.

Thesis (M.A.Sc.)--University of Toronto, 2006.

Electronic version licensed for access by U. of T. users.

ROBARTS MICROTEXT copy on microfiche.