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Article
Laser Processing For Nanoscale Size Quantum Wires of AlGaAs/GaAs
عملية الليزر للمقاس النانوي في الاسلاك الكمية لـAlGaAs/GaAs

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Abstract

In this work we investigate and calculate theoretically the variation in a number of optoelectronic properties of AlGaAs/GaAs quantum wire laser, with emphasis on the effect of wire radius on the confinement factor, density of states and gain factor have been calculated. It is found that there exist a critical wire radius (rc) under which the confinement of carriers are very weak. Whereas, above rc the confinement factor and hence the gain increase with increasing the wire radius.

في هذا العمل تم التحقق بالحساب النظري للتغيير في عدد من الخواص الالكتروبصرية لليزر السلك الكمي لAlGaAs/GaAs))، وقد تم التاكيد على حساب تاثير نصف قطر السلك على عامل الحصر ، كثافة الحالات، وعامل الكسب. لقد وجدنا ان هناك قيمة حرجة (r_c) لنصف قطر السلك ، يكون تحتها حصر الحاملات ضعيف جدا. في حين، عندما تكون القيمة اعلى منها يزداد عامل الحصر وبذلك يزداد الكسب مع زيادة نصف قطر السلك.


Article
NANOLASERS Lasing from Nanoscale Quantum Wires (Review Article)

Author: S.S. Maeo
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2007 Volume: 3 Issue: 4 Pages: 3-46
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

This article provides an overview of the physics and technologies behind the rapid progress of miniaturization of semiconductor lasers, in particular the quantum wire lasers based on onedimensional nanoscale optical gain media. Since the first report of lasing in quantum wires by Kapon and his co-workers [1], quantum wire lasers have evolved from .microlasers. in which the onedimensional nanostructure is embedded in a micron size optical cavity, to .nanolasers. in which, as we recently demonstrated [2], the material gain and optical feedback are simultaneously achieved by individual nanoscale quantum wires. One-dimensional semiconductor fabrication technologies based on nanoscale lithography, selforganization, selective growth, and chemical synthesis will be reviewed along with recent advances of quantum wire lasers built upon each of these fabrication technologies.

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