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Investigation of quadratic electro-optic effects and electro-absorption process in GaN/AlGaN spherical quantum dot

Mohammad Kouhi1*, Ali Vahedi1, Abolfazl Akbarzadeh2*, Younes Hanifehpour3 and Sang Woo Joo3*

Author Affiliations

1 Department of Physics, College of Science, Tabriz Branch, Islamic Azad University, Tabriz 5157944533, Iran

2 Department of Medical Nanotechnology, Faculty of Advanced Medical Science, Tabriz University of Medical Sciences, Tabriz 5154853431, Iran

3 School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, South Korea

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Nanoscale Research Letters 2014, 9:131  doi:10.1186/1556-276X-9-131

Published: 19 March 2014


Quadratic electro-optic effects (QEOEs) and electro-absorption (EA) process in a GaN/AlGaN spherical quantum dot are theoretically investigated. It is found that the magnitude and resonant position of third-order nonlinear optical susceptibility depend on the nanostructure size and aluminum mole fraction. With increase of the well width and barrier potential, quadratic electro-optic effect and electro-absorption process nonlinear susceptibilities are decreased and blueshifted. The results show that the DC Kerr effect in this case is much larger than that in the bulk case. Finally, it is observed that QEOEs and EA susceptibilities decrease and broaden with the decrease of relaxation time.

Quadratic electro-optic effects; Third-order susceptibility; Spherical quantum dot; Relaxation time