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Proceedings Paper

Optical propeties of In1-xGaxAsyP1-y multiple quantum well heterostructure lasers
Author(s): C. Rejeb; Romain Maciejko; Richard Leonelli; D. Morris
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Paper Abstract

Understanding the physics of Ini..GaAsPi multiple quantum well (MQW) nanostructures is essential for the development of new photonic devices such as lasers, amplifiers and modulators. In this work, optical and structural properties as well as vertical transport of three different heterostructures grown by metalorganic vapor phase epitaxy and emitting at 1 .33 tm and 1 .55 jim have been studied using continuous wave and time-resolved photoluminescence (cw-PL and TRPL) and high resolution x-ray diffraction (HRXRD). Cw-PL measurements show an anomalous PL characteristics for the structure with a thicker active layer which is discussed in terms of electron-acceptor transitions, donor-acceptor pairs, and constraint relaxation and related structural defects. The overall observed red shift with increasing temperature is interpreted as resulting from two opposite and competitive processes: band-gap shrinkage (dominant) and blue shi:ft caused by fluctuations in the QW layer thickness across the lateral sample direction. In the observed full width at half maximum, we identified a component of 8 meV as a contribution from longitudinal optical phonons. At high excitation densities, it is shown that carrier spillover and Auger recombination may be the major mechanisms limiting the quantum efficiency. For TRPL measurements, carrier cooling rates are discussed in terms of concurrent and opposite scattering mechanisms. It is found that the rise times of the QWs and the confinement region increase slightly (''2 ps) on decreasing the excitation wavelength. The observed difference is attributed to a higher initial carrier temperature associated with the shorter excitation wavelength. Comparable times of 4 ps are observed for the carrier transport and relaxation time within the confinement region and the carrier capture time in the quantum wells.

Paper Details

Date Published: 15 December 2000
PDF: 18 pages
Proc. SPIE 4087, Applications of Photonic Technology 4, (15 December 2000); doi: 10.1117/12.406456
Show Author Affiliations
C. Rejeb, Ecole Polytechnique (Canada)
Romain Maciejko, Ecole Polytechnique (Canada)
Richard Leonelli, Univ. de Montreal (Canada)
D. Morris, Univ. de Sherbrooke (Canada)

Published in SPIE Proceedings Vol. 4087:
Applications of Photonic Technology 4
Roger A. Lessard; George A. Lampropoulos, Editor(s)

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