تاثیر اندازه و موقعیت نقص روی اثر الکترواپتیک مربعی نقطه کوانتومی کروی GaN/AlGaN

نویسندگان

1 گروه فیزیک، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

2 گروه نانوتکنولوژی پزشکی، دانشکده علوم نوین پزشکی، دانشگاه علوم پزشکی تبریز، تبریز، ایران

چکیده

در این مقاله، یک نقطه کوانتومی کروی جدید برای افزایش و مدیریت پذیرفتاری نوری غیرخطی مرتبه سوم اثر الکترو اپتیک مربعی پیشنهاد شده‌است. این نانوساختار شامل پوسته نقص احاطه شده توسط دو چاه پتانسیل هست. اندازه نقطه کوانتومی، ضخامت، موقعیت و پتانسیل پوسته‌ی نقص تاثیر زیادی روی پذیرفتاری نوری غیرخطی مرتبه سوم دارند. با حل عددی معادله شرودینگر در تقریب جرم موثر، پذیرفتاری نوری غیرخطی مرتبه سوم محاسبه شد. نتایج نشان می‌دهند با افزایش اندازه نقطه‌ی کوانتومی پذیرفتاری نوری غیرخطی مرتبه سوم افزایش می‌یابد. همچنین با افزایش ضخامت پوسته‌ی نقص پذیرفتاری نوری غیرخطی مرتبه سوم افزایش و طول موج تشدید انتقال به سرخ پیدا می‌کند. بیشترین مقدار پذیرفتاری نوری غیرخطی مرتبه سوم وقتی قابل حصول هست که در وضعیت متقارن موقعیت پوسته‌ی نقص، پتانسیل نقص برابر پتانسیل پله شود.

کلیدواژه‌ها


عنوان مقاله [English]

Influence of Size and Position of Defect on Quadratic Electro Optic Effect of GaN/AlGaN Spherical Quantum Dot

نویسندگان [English]

  • M. kouhi 1
  • A. Vahedi 1
  • A. Akbarzadeh 2
چکیده [English]

In this paper, a new spherical quantum dot is proposed to management and enhancement of third order nonlinear optical susceptibility of quadratic electro optic effect. This nanostructure is containing defective shell surrounding with two well. The size of quantum dot, thickness, position and potential of defect have a significant effect on third order optical susceptibility. By numerically solving of Schrödinger equation in the effective mass approximation the third order nonlinear optical susceptibility were calculated. The results are shown that with increasing of dot size the third order nonlinear optical susceptibility is increased. Also, with increasing of defect shell thickness the third order nonlinear optical susceptibility is increased and resonance wavelength is red shifted. The most value of third order optical susceptibility is available when in the symmetric condition of defect position, the defect potential becomes equal to the barrier potential.

کلیدواژه‌ها [English]

  • Quadratic Electro-Optic Effect
  • Optical Susceptibility
  • defect
  • Quantum Dot
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