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Proceedings Paper

Theoretical design of low-threshold current density of InAlGaAs material system
Author(s): Karen Lin Ke; Soo-Jin Chua; Wei Jun Fan
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Paper Abstract

A series of theoretical investigations of the quaternary InAlGaAs material system are carried out. The electronic band structures, the density-of-states, the optical gain spectra and the radiative current density have been investigated based on the Hamiltonian derived using the k.p method. We investigated the dependence of the optical gain and transparent current density on the well width, barrier height, and strain using a numerical approach with high accuracy. By varying the well width, mole fraction in the well material and the Al mole fraction in the barrier the effects of quantum confinement and compressive strain are examined. Furthermore, we demonstrate that a reduction of the well width offers improved modal gain over all radiative current densities. Two different material systems, InAlGaAs on InP and GaAs substrates, strained and unstrained, are examined, respectively. Our results suggest that a suitable combination of well width and barrier height should be selected in improving the TE mode optical gain in InAlGaAs single QW. A very low transparent threshold current density 35 A/cm2 of (formula available in paper) strained quantum well laser is predicted. These theoretical results would be useful for design and further performance improvement of the quaternary InAlGaAs strained QW laser diodes.

Paper Details

Date Published: 9 October 2000
PDF: 6 pages
Proc. SPIE 4225, Optical Interconnects for Telecommunication and Data Communications, (9 October 2000); doi: 10.1117/12.402685
Show Author Affiliations
Karen Lin Ke, Institute of Materials Research and Engineering (Singapore)
Soo-Jin Chua, Institute of Materials Research and Engineering (Singapore)
Wei Jun Fan, Institute of Materials Research and Engineering (Singapore)

Published in SPIE Proceedings Vol. 4225:
Optical Interconnects for Telecommunication and Data Communications
Xiaomin Ren; Suning Tang, Editor(s)

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