中国物理B ›› 2016, Vol. 25 ›› Issue (5): 57801-057801.doi: 10.1088/1674-1056/25/5/057801

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Effect of size and indium-composition on linear and nonlinear optical absorption of InGaN/GaN lens-shaped quantum dot

Ahmed S Jbara, Zulkafli Othaman, M A Saeed   

  1. 1. Center for Sustainable Nanomaterials, Universiti Teknologi Malaysia, Skudai-81310, Johor Bahru, Malaysia;
    2. Physics Department, Science College, Al-Muthanna University, Samawah, Iraq;
    3. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Skudai-81310, Johor Bahru, Malaysia
  • 收稿日期:2015-10-11 修回日期:2016-01-13 出版日期:2016-05-05 发布日期:2016-05-05
  • 通讯作者: Zulkafli Othaman E-mail:zulothaman@gmail.com
  • 基金资助:
    Project supported by the Ministry of Higher Education and Scientific Research in Iraq, Ibnu Sina Institute and Physics Department of Universiti Teknologi Malaysia (UTM RUG Vote No. 06-H14).

Effect of size and indium-composition on linear and nonlinear optical absorption of InGaN/GaN lens-shaped quantum dot

Ahmed S Jbara1,2,3, Zulkafli Othaman1,3, M A Saeed3   

  1. 1. Center for Sustainable Nanomaterials, Universiti Teknologi Malaysia, Skudai-81310, Johor Bahru, Malaysia;
    2. Physics Department, Science College, Al-Muthanna University, Samawah, Iraq;
    3. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Skudai-81310, Johor Bahru, Malaysia
  • Received:2015-10-11 Revised:2016-01-13 Online:2016-05-05 Published:2016-05-05
  • Contact: Zulkafli Othaman E-mail:zulothaman@gmail.com
  • Supported by:
    Project supported by the Ministry of Higher Education and Scientific Research in Iraq, Ibnu Sina Institute and Physics Department of Universiti Teknologi Malaysia (UTM RUG Vote No. 06-H14).

摘要: Based on the Schrödinger equation for envelope function in the effective mass approximation, linear and nonlinear optical absorption coefficients in a multi-subband lens quantum dot are investigated. The effects of quantum dot size on the interband and intraband transitions energy are also analyzed. The finite element method is used to calculate the eigenvalues and eigenfunctions. Strain and In-mole-fraction effects are also studied, and the results reveal that with the decrease of the In-mole fraction, the amplitudes of linear and nonlinear absorption coefficients increase. The present computed results show that the absorption coefficients of transitions between the first excited states are stronger than those of the ground states. In addition, it has been found that the quantum dot size affects the amplitudes and peak positions of linear and nonlinear absorption coefficients while the incident optical intensity strongly affects the nonlinear absorption coefficients.

关键词: linear and nonlinear optical absorption coefficients, lens quantum dot, finite element method

Abstract: Based on the Schrödinger equation for envelope function in the effective mass approximation, linear and nonlinear optical absorption coefficients in a multi-subband lens quantum dot are investigated. The effects of quantum dot size on the interband and intraband transitions energy are also analyzed. The finite element method is used to calculate the eigenvalues and eigenfunctions. Strain and In-mole-fraction effects are also studied, and the results reveal that with the decrease of the In-mole fraction, the amplitudes of linear and nonlinear absorption coefficients increase. The present computed results show that the absorption coefficients of transitions between the first excited states are stronger than those of the ground states. In addition, it has been found that the quantum dot size affects the amplitudes and peak positions of linear and nonlinear absorption coefficients while the incident optical intensity strongly affects the nonlinear absorption coefficients.

Key words: linear and nonlinear optical absorption coefficients, lens quantum dot, finite element method

中图分类号:  (Optical properties of bulk materials and thin films)

  • 78.20.-e
78.67.Hc (Quantum dots) 02.70.Dh (Finite-element and Galerkin methods)