Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite InxGa1-xN/GaN nanostructures

doi:10.1088/1674-1056/ab9291

中国物理B ›› 2020, Vol. 29 ›› Issue (8): 87802-087802.doi: 10.1088/1674-1056/ab9291

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇下一篇

Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite In_xGa_1-xN/GaN nanostructures

Xiao-Chen Yang(杨晓晨), Yan Xing(邢雁)

School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China

收稿日期:2020-03-08 修回日期:2020-05-04 出版日期:2020-08-05 发布日期:2020-08-05
通讯作者: Yan Xing E-mail:xingy@imu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11947414) and the Research Program of Science and Technology at University of Inner Mongolia Autonomous Region, China (Grant No. NJZZ19001).

Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite In_xGa_1-xN/GaN nanostructures

Xiao-Chen Yang(杨晓晨), Yan Xing(邢雁)

School of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China

Received:2020-03-08 Revised:2020-05-04 Online:2020-08-05 Published:2020-08-05
Contact: Yan Xing E-mail:xingy@imu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11947414) and the Research Program of Science and Technology at University of Inner Mongolia Autonomous Region, China (Grant No. NJZZ19001).

摘要/Abstract

摘要： The linear and nonlinear optical absorption coefficients (ACs) and refraction index changes (RICs) of 1s-1p, 1p-1d, and 1f-1d transitions are investigated in a wurtzite In_xGa_1-xN/GaN core-shell quantum dot (CSQD) with donor impurity by using density matrix approach. The effects of built-in electric field (BEF), ternary mixed crystal (TMC), impurity, and CSQD size are studied in detail. The finite element method is used to calculate the ground and excited energy state energy and wave function. The results reveal that the BEF has a great influence on the linear, nonlinear, and total ACs and RICs. The presence of impurity leads the resonant peaks of the ACs and RICs to be blue-shifted for all transitions, especially for 1s-1p transition. It is also found that the resonant peaks of the ACs and RICs present a red shift with In-composition decreasing or core radius increasing. Moreover, the amplitudes of the ACs and RICs are strongly affected by the incident optical intensity. The absorption saturation is more sensitive without the impurity than with the impurity, and the appearance of absorption saturation requires a larger incident optical intensity when considering the BEF.

关键词: core-shell quantum dot, linear and nonlinear optical properties, impurity, ternary mixed crystal

Abstract: The linear and nonlinear optical absorption coefficients (ACs) and refraction index changes (RICs) of 1s-1p, 1p-1d, and 1f-1d transitions are investigated in a wurtzite In_xGa_1-xN/GaN core-shell quantum dot (CSQD) with donor impurity by using density matrix approach. The effects of built-in electric field (BEF), ternary mixed crystal (TMC), impurity, and CSQD size are studied in detail. The finite element method is used to calculate the ground and excited energy state energy and wave function. The results reveal that the BEF has a great influence on the linear, nonlinear, and total ACs and RICs. The presence of impurity leads the resonant peaks of the ACs and RICs to be blue-shifted for all transitions, especially for 1s-1p transition. It is also found that the resonant peaks of the ACs and RICs present a red shift with In-composition decreasing or core radius increasing. Moreover, the amplitudes of the ACs and RICs are strongly affected by the incident optical intensity. The absorption saturation is more sensitive without the impurity than with the impurity, and the appearance of absorption saturation requires a larger incident optical intensity when considering the BEF.

Key words: core-shell quantum dot, linear and nonlinear optical properties, impurity, ternary mixed crystal

中图分类号: (Quantum dots)

78.67.Hc

78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)) 42.65.-k (Nonlinear optics)

杨晓晨, 邢雁. Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite In_xGa_1-xN/GaN nanostructures[J]. 中国物理B, 2020, 29(8): 87802-087802.

Xiao-Chen Yang(杨晓晨), Yan Xing(邢雁). Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite In_xGa_1-xN/GaN nanostructures[J]. Chin. Phys. B, 2020, 29(8): 87802-087802.

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Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite In_xGa_1-xN/GaN nanostructures

Effects of built-in electric field and donor impurity on linear and nonlinear optical properties of wurtzite In_xGa_1-xN/GaN nanostructures

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