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1. 中南大学物理与电子学院 超微结构与超快过程湖南省重点实验室,湖南 长沙,410083
2. 东南大学 先进光子学中心,江苏 南京,210096
纸质出版日期:2017-12-5,
收稿日期:2017-4-16,
修回日期:2017-5-5,
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张玮, 王迎威, 肖思等. 铝镓氮薄膜双光子吸收效应[J]. 发光学报, 2017,38(12): 1605-1610
ZHANG Wei, WANG Ying-wei, XIAO Si etc. Two-photon Absorption in Al<sub><em>x</em></sub>Ga<sub>1-<em>x</em></sub>N Films[J]. Chinese Journal of Luminescence, 2017,38(12): 1605-1610
张玮, 王迎威, 肖思等. 铝镓氮薄膜双光子吸收效应[J]. 发光学报, 2017,38(12): 1605-1610 DOI: 10.3788/fgxb20173812.1605.
ZHANG Wei, WANG Ying-wei, XIAO Si etc. Two-photon Absorption in Al<sub><em>x</em></sub>Ga<sub>1-<em>x</em></sub>N Films[J]. Chinese Journal of Luminescence, 2017,38(12): 1605-1610 DOI: 10.3788/fgxb20173812.1605.
基于飞秒激发Z扫描实验技术,研究了氮化镓薄膜和不同铝掺杂含量的掺铝氮化镓(以下简称铝镓氮)薄膜的超快非线性光学响应特性。在开孔Z-scan测试中,纯GaN晶体薄膜表现出典型的双光子吸收特性,双光子吸收系数为3.5 cm/GW,且随着激发光强的增大而逐渐减小。随后测试了不同铝掺杂含量的Al
x
Ga
1-
x
N薄膜的非线性吸收系数。结果表明,随着铝掺杂摩尔分数的提高(0,19%,32%,42%),非线性吸收系数逐渐减小(18,10,6,5.6 cm/GW)。结合半导体非线性吸收理论分析,Al
x
Ga
1-
x
N薄膜材料的非线性过程主要是双光子吸收主导非线性响应物理过程。实验结果与半导体双光子吸收过程Sheik-Bahae理论符合得很好。
The ultrafast nonlinear absorption response of GaN and Al
x
Ga
1-
x
N films was studied by employing conventional femto-second Z-scan measurements. In the Z-scan
GaN films exhibit typical two-photon absorption property and with a two-photon absorption coefficient of 3.5 cm/GW. Simultaneously
the two-photon absorption coefficient decreases with the increase of the excitation intensity. GaN films possess excellent nonlinear optical property which is dominated by two-or multi-photon absorption. The Z-scan measurement was further used for Al
x
Ga
1-
x
N films with different Al element content. It is found that the two-photon absorption coefficient of Al
x
Ga
1-
x
N films closely dependent on the mole fraction of Al element. The two-photon absorption coefficient decreases from 18 cm/GW to 5.6 cm/GW with the increase of Al mole fraction from 0 to 0.42. Considering the conventional semiconductor nonlinear absorption theory
it is believed that the observed nonlinear absorption originates from the two-photon absorption dominant nonlinear response. The experimental results are in good agreement with the Sheik-Bahae theoretical prediction for two-photon absorption coefficient.
铝镓氮薄膜双光子吸收能带调控
AlxGa1-xN filmstwo-photon absorptionband-gap engineering
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