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

Jbara, Ahmed S. and Othaman, Zulkafli and Saeed, Mohammad Alam (2016) Effect of size and indium-composition on linear and nonlinear optical absorption of InGaN/GaN lens-shaped quantum dot. Chinese Physics B, 25 (5). pp. 1-9. ISSN 1674-1056

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Official URL: http://dx.doi.org/10.1088/1674-1056/25/5/057801

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.

Item Type:Article
Uncontrolled Keywords:finite element method, lens quantum dot
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:69301
Deposited By: Siti Nor Hashidah Zakaria
Deposited On:22 Nov 2017 08:45
Last Modified:22 Nov 2017 08:45

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